Hi Nisha,
If you wish to make thePartner bank typefield visible in F-43 then you should first maintain details in the vendor master for more at least 2 bank .Once you maintain and then try to check in F-43, you will have the drop down available to choose from previously saved banks.
Please see the above screen shot for reference.
If you wish more information, do let me know.
Regards,
Rithin