With Range(Current_Sheet)
.FormulaR1C1 =
"=SUMIF(NDIRECT(R5C),RC1,OFFSET(NDIRECT(R5C),0,R1C ,ROWS(NDIRECT(R5C)),1))"
.Value = .Value
End With

The indirect is referencing the cell that contyains the name of a defined
range name in another worksheet

Any help would be really appreciated

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Helping Is always a good thing