Can I bake occlusion areas sepeately ?

Questions & Answers
1

I was hoping to have some specific settings for each occlusion areas according to the level of details involved to make the baking process faster but it doesn’t seem to be possible!
so what should I do ?

should I add the area to the whole scene and bake it onece and for all ?
What if I add some new objects ? then I’d have to go through the whole baking process again ?

2

I don’t guess it would be possible but it’s a good thing that occlusion baking process is fast enough. I thought it would be as slow as lightmapping.