How do i change my formable nations ideology?

[vPieces 0]

I want to create a scenario,where i have a custom nation and your goal is to go from tribe too Republic and then Monarchy/empire,But there is a problem,I dont know how to make that when you form a custom formable it changes to the government you select

[thecarvalhogamer 27]

 

 

 

I'm looking for this too

 

 

 

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