User Entry in Web-Dynpro for Planning 10.1

We have built a web-dynpro out of which we wish to add the functionality of executing a planning sequence (BPC10.1).

We thereby want to allow the user to manually enter values for certain characteristics, values which need to be brought back to the filter/planning function in the planning sequence (e.g. the user manually enters 'A' as "Copy From" and 'B' as "Copy To" for the function of copying values from company A to company B ).

We know how to integrate a planning sequence in the web-dynpro (e.g. by button), but how can the interaction with the manual entry by the user be modelled most efficiently?

It thereby does not matter if the the user performs the manual entry before or after actioning the button for the planning sequence.