Copying data for period range

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Hi

I need to copy data for a period range as below.

Ex: i have a loan start date : 01-may-2020. and loan end date as 31-apr-2026 (72 no of periods/months in between)

Loan Fixed rate of 4% is sent to loan start date year and month which is "FY20" and "May". and also to the end date which is "Apr" and "FY26".

Whatever the periods/year in between (For ex: jun->fy20, jul-fy20 till apr-fy25) this 4% interest rate should be copied.

Tried doing several ways. no success yet. Pls guide.

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