Select item from slicer by coding

Hello Dreamer_Argento ,

If you want that certain measure is forced to certain selection you can use as  calculate modifier.

For example if you have measure: Sum('orders'[Salesamount])
You can force it the certain selection for example:

Calculate(Sum('orders'[Salesamount]),'customer'[Customer Name]="Microsoft")

Other option is to force visuals that use the measure as visual filtter 

Choose the selections and lock it

Hope this helps!