RFUI - Adding New Screens

Hi,

In RFUI, Im trying to add a new screen in Receiving HUs section.

For this I created a new screen in the Template and did the relevant config changes .

But I need to create a new Function module to add functionality for this new screen.

My question is : How do I create this new FM? Should I need to create a custom function group?

There is a standard function group . Do I need tro create the new FM here ?

Please suggest.

Thanks