I need some advice.
Previously I have created 2 field in the database which contact Game01 & Game02. Then I realize that I want to add them together.
I created a new field called "Total Pin" and add a hook on it.
for new entry, it does the job of added Game01+Game02 into Total Pin. But for my previous data it seems i can't do the calculation.
I'm not sure whether to start. can someone guide me?