Add a setting in target for "Slime, 0-100%, attack, blablabla"
Then you have a 'frag help' in that option you have 'summon identification', check that one.
Now you go and get yourself a slime, when the slime clones/summon one will be renamed "Mother Slime", as you might understand this will be the one giving exp. As long as you DON'T have 'mother slime' in your targetlist the bot wont attack it.

Enjoy!