The Different between Visit Visa and residence visa

i have mainly the same issue , i've got a buisness visit visa , since we have a project in doha which is for 3 years renewable yearly,

but what i'm concerned id that i i don't know if it can be converted to work visa , so i can get my family, put my kids in school,......etc,

i tried to get an answer about these issue from the company,always telling me yes why not , but i did not get a clear answer,

since the contract is between me and a company(not in qatar), to be seconded to a third company in qatar to work in the project.

so my qestion is is it possible to do so.

thanks in advance for all