Necromancy - spawn all of your minions with one spell

[altrans]

Hey,

 

I love to play as a Necromancer and having a huge army is just so much fun. ( I use Perma for my ultimate skeleton army )
But when I am out of combat it get's really annoying with all those skeletons around me,

is there a way to make them all disappear and spawn again when i need them ?

 

Thank you for your help :)