More User Def fields

Currently our task table doesnt have anymore spare User_Def fields. is there any other way to add fields to this table or do we have to create a brand new table and link them together? Our sister company ended up creating another table (CUST_TASK) but the user defs all work the same. In the UI designer you’ll see all these in the task selection

However were trying to do insert business rules using the CUST_TASK table and running into issues. If we could do this on the task table that would be great but there are no empty user defs left