>Can someone help me with the correct syntax for the following line?
>
>replace this.Parent.tLcost6.controlsource with this.parent.txtLcost_6.value
>
>Thanks

What is .tlcost6?

this.Parent.tLcost6.value = this.parent.txtLcost_6.value

This assumes that tLcost6 is a form field bound to a table field. Equating the two will auto. change the value in the table.

ControlSource is typically TableName.FieldName. You only:

replace Fieldname with value in TableName

in FP.

ControlSource is a character string and you'd need to parse outr the "fieldname" part and macro substitute it in the replace command.

HTH

Terry