How to make a advanced spawning system that tames and pops a gui

here is the advanced summoning tutorial:

first make your entity
then make an item that will open a gui later
now you have to make your gui 

Item gui procedure:
https://imgur.com/ZuguUIa 
there is no need to put the procedure on a trigger as it already tracks what item they are holding
this will choose the item and when right clicked will open your gui

now for the currency system 
you have to make an item so you can check their inventory for an item then summon
here is the actual summon procedure:
https://imgur.com/a/knxGd4a
you will now need to go back to gui
and make a button now and use trigger on button clicked
choose this procedure

if you just want to summon with needing nothing use this
https://imgur.com/a/DJdetoD

now you know how to make a advanced spawning system!