I found a way to do it without linking the spreadsheets though, I used record macro to input this a new column with this code
Code:
ActiveCell.FormulaR1C1 = _
"=IF(ISERROR(MATCH(C[-50],Sheet1!C[-50],0)),"""",""Duplicate"")"
ActiveCell.FormulaR1C1 = _
"=IF(ISERROR(MATCH(C[-50],Sheet1!C[-50],0)),"""",""Duplicate"")"
Private Sub Command16_Click()
Dim Task As String
Dim startDate As Date
Private Sub Command8_Click()
Dim dbs As DAO.Database
Dim rst As DAO.Recordset
Dim rstInsert As DAO.Recordset
Set dbs = CurrentDb
Set rst = dbs.OpenRecordset("Table2", dbOpenDynaset)
Set rstInsert = dbs.OpenRecordset("Acknowledgement",
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