How to write SCHEMA to add a wage type?

In my company,there is a wage type 9001(allowance to all) every month,

the amount is difference for every month,but is same for all person.

we do not want maintan user master data because it is same to all user.

so I want to modify SCHEMA to add the wage type to all,and getting amount

from T510J.

How to modify the SCHEMA?