Need help with coding.

Code:

    [#Field: VBOrder OrdItem]
       
        Set as            : If $$IsEmpty:$$Value And $$Line=1 Then $$BaseOwner:$VoucherNumber + ".1" Else If $$IsEmpty:$$Value And $$Line=2 Then $$BaseOwner:$VoucherNumber + ".2" Else $OrderNo
           
        Validate        : If $$Line = 1 Then NOT $$IsEmpty:$$Value Else Yes
        Skip Forward    : $$Line > 1
        Inactive        : $$IsEnd:$StockItemName

How do I add 0.1 after every line in an efficient way without having to write If function for every line.
https://i.imgur.com/5Tf4ZC2.png

 

Thank you Sir.

 

How do I get $$Line from the main report in to the Purchase Order number.
[#Field: VBOrder OrdItem]
Set as : If $$IsEmpty:$$Value Then $$BaseOwner:$VoucherNumber + "." + $$BaseOwner:$$String:$$LINE Else $OrderNo
Validate : If $$Line = 1 Then NOT $$IsEmpty:$$Value Else Yes
Skip Forward : $$Line > 1
Inactive : $$IsEnd:$StockItemName