hello guys

i am trying to mate two (three but it seems relatively easy once i get an answer for this) parts together

i have a base block and need to put two tabs on top of this

a tab will be 10mm apart from the center of the block so two blocks will be 20mm apart

i guess i can coincide bottom face of the tap and top face of the block and measure distance from center of the hole to where the tap is supposed to be but i feel like its not the "right and easier" way

can you experts guide me?

i am new to solidworks and it seems like a simple task but i cant get it correctly

please help!

thank you