Duplicate a row and replace a field

[Marv0Mat]

Hello there,

i have 2 Tables:

The First Table has sometimes 'RP*' Values at ZFObj_Erst. If this is the case i have to copy this row up to 6 times and replace the ZFObj_Erst with the "FzNr" of this Table:

But sometimes , the 2nd table has diffrent Days and i need to filter the closest Date to "Beg_Datum" of the first Table.

Is anyone able to help me or can give me tips?