Dear Santosh,
ok, I understand it as follows: the forms technologies SCR and SF are still supported. So no need to convert any forms to IFbA in S4H. There is a new output framework for applications in S4H which uses BRF+ for any new (meaning newly developed in S4H) forms.
It also says that even old NAST based output forms can work in S4H.
I don't believe there exists an automatic tool which tells you which ones are "old, migrated" forms and which ones are "new S4H" forms. What you can do is make a list of all billing-related forms/print programs you use in the existing ERP system and inquire with SAP whether these still are supported in S4H. Sorry, I have no better idea.
Regards,
Alex