Hi Krishna,
I guess it should be sufficient to have just 1 G/L account for the position of fixed-term deposits, as you can use the standard report TPM12 to report over outstanding position per different Business partner, which is equal to different bank you deal with on a specific date. the advantage of this report is that you can even report over periods, which are in the future, therefore no data is transferred to accounting yet.
hope this will help you.
Kind regards,
Renatas