Pathfinder Adding equipment stats to sheet.

I am wondering if there is a way to add stats from equipment to character just like buffs so they don't stack. For example, I have a belt of giant strength +2, and if someone were to cast Bull's Strength on me I should only get the buffs +4 as they are both enhancement bonuses and don't stack. The same goes for other buffs and items like ring of protection etc. The ring I know how to solve as I just add it under deflection bonus, and when a buff with that bonus is given it takes the higher value but no idea how to solve it for the belt and similar items as currently I just add the +2 to STR but when I apply Bull's Strength it just stacks with each other. Thnx in advance

Hi Arid,  Which character sheet are you using? If you don't know the name please supply a screenshot. 

That is the Pathfinder by Roll20 sheet.  How are you writing the bonuses? 

Well that is the problem. I have the bonuses for buffs under buffs.  but I have no idea where to put in item stat enhancements like Belt of Giant STR and such items so that when I activate a buff with the same bonus type, eg enhancement bonus, it prevents stacking. ATM the belt bonus I put into the character sheet but when I activate bulls STR they stack. 

Please screenshot your Belt while it is being edited.  Edit: looking over the Equipment section, it doesn't appear to automatically apply bonuses. Use the Buffs section for that.  Also, I noticed you mispelled Enhancement in your Bull's Strength. 

I wanted to avoid the buff section for items as they are permanent while buffs make them marked as temporary but I guess it is the only way. Thank you.