Do we Add Profit and Overhead on preliminaries ?

I have two questions:

1- In the BOQ :for example plaster work overhead will be included in every item, but does the profit will be included in every item also, or it will at the end sum as percentage. 2- When they calculate preliminaries as lump sum, does they apply overhead and profit  on this amount? then give the lump sum in the BOQ?

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