I use to do that to modify entitlements. For me the best way is to create the OFS lines in the excel, using CONCATENATE to create the command, and then copy the results to a txt file and copy it to the OFS in dir. If you have the fields of each record in a line, it would be something like the following:
=CONCATENATE("CUSTOMER,OFS/I/PROCESS,//,",A1,", MNEMONIC::=",B1,",SECTOR::=",C1)
assuming that the customer number is in the A column, mnemonic in the B column, sector in the C column, and so on.
Regards
Jose