Copy To System Form

Hi,

I have developed a User defined window which is having Header details and Item/Service details (more than 100 Lines).

I have a button to copy the value from this UDform  to AR Invoice. Can any one tell me the best way to copy the value to AR Invoice very fast since I have 100 Line in my document, it may take some time if I use Matrix - Edit Cell and set value on each column. I have to set values to NON-VISABLE columns in AR Invoice also.

I am using SAP B1 9.0 PL 5.

Thank You