Forms :: Automation - Fill Another Form With Values Of First Form

i just created two forms which r so inter-rel. with each other
1. FormName : Invoice_SL
Form controls which need to be copied to another
form :
a> PO No b> PO Date c>Dispatch Details
d> - is a filtered list depending upon UID of Invoice_SL Form

2. formName : Challan_DLR
Form fields are :
ChallanID, Challan Date, PO no., PO Date, Dispatch Details
list of items to be sent-- a filtered list depending upon UID
of Invoice_SL form

now what i want:
Just a command button in Invoice_SL Form to Open(pre-made form)
Challan_DLR form and Copy-paste all these controls (same named)
from Invoice_SL to Challan_DLR form