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.
If you wish more information, do let me know, I will share the screen shot of the same.
Regards,
Rithin