diff --git a/packages/datalib/src/runMacro.ts b/packages/datalib/src/runMacro.ts
index 0e45bc4a1..37a136f5b 100644
--- a/packages/datalib/src/runMacro.ts
+++ b/packages/datalib/src/runMacro.ts
@@ -12,7 +12,12 @@ const getMacroFunction = {
 }
 `,
   transformRows: (code) => `
-(rows, args, modules, selectedCells, cols) => {
+(rows, args, modules, selectedCells, cols, columns) => {
+  ${code}
+}
+`,
+transformData: (code) => `
+(rows, args, modules, selectedCells, cols, columns) => {
   ${code}
 }
 `,
@@ -80,7 +85,8 @@ function runTramsformValue(
 function removePreviewRowFlags(rows) {
   rows = rows.filter((row) => row.__rowStatus != 'deleted');
   rows = rows.map((row) => {
-    if (row.__rowStatus || row.__modifiedFields) return _.omit(row, ['__rowStatus', '__modifiedFields']);
+    if (row.__rowStatus || row.__modifiedFields || row.__insertedFields || row.__deletedFields)
+      return _.omit(row, ['__rowStatus', '__modifiedFields', '__insertedFields', '__deletedFields']);
     return row;
   });
   return rows;
@@ -101,7 +107,8 @@ function runTramsformRows(
       macroArgs,
       modules,
       selectedCells,
-      data.structure.columns.map((x) => x.columnName)
+      data.structure.columns.map((x) => x.columnName),
+      data.structure.columns
     );
     if (!preview) {
       rows = removePreviewRowFlags(rows);
@@ -115,6 +122,39 @@ function runTramsformRows(
   };
 }
 
+function runTramsformData(
+  func,
+  macroArgs: {},
+  data: FreeTableModel,
+  preview: boolean,
+  selectedCells: MacroSelectedCell[],
+  errors: string[] = []
+) {
+  try {
+    let { rows, columns, cols } = func(
+      data.rows,
+      macroArgs,
+      modules,
+      selectedCells,
+      data.structure.columns.map((x) => x.columnName),
+      data.structure.columns
+    );
+    if (cols && !columns) {
+      columns = cols.map((columnName) => ({ columnName }));
+    }
+    if (!preview) {
+      rows = removePreviewRowFlags(rows);
+    }
+    return {
+      structure: { columns },
+      rows,
+    };
+  } catch (err) {
+    errors.push(`Error processing data: ${err.message}`);
+  }
+  return data;
+}
+
 export function runMacro(
   macro: MacroDefinition,
   macroArgs: {},
@@ -136,5 +176,9 @@ export function runMacro(
   if (macro.type == 'transformRows') {
     return runTramsformRows(func, macroArgs, data, preview, selectedCells, errors);
   }
+  if (macro.type == 'transformData') {
+    // @ts-ignore
+    return runTramsformData(func, macroArgs, data, preview, selectedCells, errors);
+  }
   return data;
 }
diff --git a/packages/web/src/freetable/FreeTableGridCore.js b/packages/web/src/freetable/FreeTableGridCore.js
index 4e0a73dd7..a81c15bed 100644
--- a/packages/web/src/freetable/FreeTableGridCore.js
+++ b/packages/web/src/freetable/FreeTableGridCore.js
@@ -30,10 +30,11 @@ export default function FreeTableGridCore(props) {
       macroPreview ? selectedCells : null,
     ]
   );
-  const display = React.useMemo(() => new FreeTableGridDisplay(modelState.value, config, setConfig, cache, setCache), [
+  const display = React.useMemo(() => new FreeTableGridDisplay(grider.model || modelState.value, config, setConfig, cache, setCache), [
     modelState.value,
     config,
     cache,
+    grider,
   ]);
 
   const handleSelectionChanged = React.useCallback(
diff --git a/packages/web/src/freetable/MacroPreviewGrider.ts b/packages/web/src/freetable/MacroPreviewGrider.ts
index 6a42b8794..e33ea59a7 100644
--- a/packages/web/src/freetable/MacroPreviewGrider.ts
+++ b/packages/web/src/freetable/MacroPreviewGrider.ts
@@ -1,5 +1,13 @@
 import { FreeTableModel, MacroDefinition, MacroSelectedCell, runMacro } from '@dbgate/datalib';
 import Grider, { GriderRowStatus } from '../datagrid/Grider';
+import _ from 'lodash';
+
+function convertToSet(row, field) {
+  if (!row) return null;
+  if (!row[field]) return null;
+  if (_.isSet(row[field])) return row[field];
+  return new Set(row[field]);
+}
 
 export default class MacroPreviewGrider extends Grider {
   model: FreeTableModel;
@@ -17,7 +25,9 @@ export default class MacroPreviewGrider extends Grider {
     const row = this.model.rows[index];
     return {
       status: (row && row.__rowStatus) || 'regular',
-      modifiedFields: row ? row.__modifiedFields : null,
+      modifiedFields: convertToSet(row, '__modifiedFields'),
+      insertedFields: convertToSet(row, '__insertedFields'),
+      deletedFields: convertToSet(row, '__deletedFields'),
     };
   }
 
diff --git a/packages/web/src/freetable/macros.js b/packages/web/src/freetable/macros.js
index e357dc8ef..8d3f5c547 100644
--- a/packages/web/src/freetable/macros.js
+++ b/packages/web/src/freetable/macros.js
@@ -111,11 +111,11 @@ return value ? value.toString().replace(new RegExp(rtext, rflags), args.replace
     code: `
 const selectedRowIndexes = modules.lodash.uniq(selectedCells.map(x => x.row));
 const selectedRows = modules.lodash.groupBy(selectedCells, 'row');
-const maxIndex = _.max(selectedRowIndexes);
+const maxIndex = modules.lodash.max(selectedRowIndexes);
 return [
   ...rows.slice(0, maxIndex + 1),
   ...selectedRowIndexes.map(index => ({
-    ..._.pick(rows[index], selectedRows[index].map(x=>x.column)),
+    ...modules.lodash.pick(rows[index], selectedRows[index].map(x => x.column)),
     __rowStatus: 'inserted',
   })),
   ...rows.slice(maxIndex + 1),
@@ -136,7 +136,63 @@ return rows.map(row => {
     __rowStatus: 'deleted',
   };
 })
-`}
+`,
+  },
+  {
+    title: 'Duplicate columns',
+    name: 'duplicateColumns',
+    group: 'Tools',
+    description: 'Duplicate selected columns',
+    type: 'transformData',
+    code: `
+const selectedColumnNames = modules.lodash.uniq(selectedCells.map(x => x.column));
+const selectedRowIndexes = modules.lodash.uniq(selectedCells.map(x => x.row));
+const addedColumnNames = selectedColumnNames.map(col => (args.prefix || '') + col + (args.postfix || ''));
+const resultRows = rows.map((row, rowIndex) => ({
+  ...row,
+  ...(selectedRowIndexes.includes(rowIndex) ? modules.lodash.fromPairs(selectedColumnNames.map(col => [(args.prefix || '') + col + (args.postfix || ''), row[col]])) : {}),
+  __insertedFields: addedColumnNames,
+}));
+const resultCols = [
+  ...cols,
+  ...addedColumnNames,
+];
+return {
+  rows: resultRows,
+  cols: resultCols,
+}
+    `,
+    args: [
+      {
+        type: 'text',
+        label: 'Prefix',
+        name: 'prefix',
+      },
+      {
+        type: 'text',
+        label: 'Postfix',
+        name: 'postfix',
+        default: '_copy',
+      },
+    ],
+  },
 ];
 
+// function f() {
+//   const selectedColumnNames = modules.lodash.uniq(selectedCells.map((x) => x.column));
+//   const addedColumnNames = selectedColumnNames.map((col) => (args.prefix || '') + col + (args.postfix || ''));
+//   const resultRows = rows.map((row) => ({
+//     ...row,
+//     ...modules.lodash.fromPairs(
+//       selectedColumnNames.map((col) => [(args.prefix || '') + col + (args.postfix || ''), row[col]])
+//     ),
+//     __insertedFields: addedColumnNames,
+//   }));
+//   const resultCols = [...cols, ...addedColumnNames];
+//   return {
+//     rows: resultRows,
+//     cols: resultCols,
+//   };
+// }
+
 export default macros;