Added abilities permanent

[NoobMapmaker]

Does anyone know a way to make the abilities that are added by trigger permanent?

For example, I use trigger to add "purge" to a unit, after it uses a morph skill the added ability is automatically gone. Morph abilities include destroyers, metamorph, NE druids etc...

Thanks

 

[Battle_Shipper]

Couldn't you add the abilities again when you detect the transformation? Or do you have too much abilities?

 

[NoobMapmaker]

Each unit has diff abilities.. the same type of unit can have completely 2 diff sets of abilities. Too many units to keep track of by triggers. Any other techniques?