Help with making unit

[Slicenstab]

Ok, so im making a footmen frenzy type map where when i have a tech (like a barracks or necropolis) it will make the corresponding units for me (footmen and ghoul). Any ideas on how to do this?

 

[darkrider]

well... you will need a condition in your trigger (the one that creates units) that checks for certain upgrade... then it will create the unit that matches that upgrade