How can I set Brewmaster's Pandarens to permanent control groups?

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How can I set Brewmaster's Pandarens to the same control groups permanently, so that I don't need to manually set them (i.e. ctrl+1, ctrl+2 etc) each time I use his ult?
Ideally I'd like Earth set to 1, Storm set to 2, and Fire set to 3 permanently, so I can micro immediately after the split.
Thanks!
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How do you assign a control group?
Control Groups To bind units to a group, select the units and then press Ctrl + Group Hotkey . To add a unit to an already existing group, select the unit and press \u21e7 Shift + Group Hotkey .How do you set up control groups in Dota 2?
Brewmaster can switch stances based on the elements he controls gaining passive bonuses that improve against enemies affected by Cinder Brew. Earth Stance - Grants 1/3/5/7 armor and 5%/10%/15%/20% Magic Resistance. Bonuses are 3x when Brewed Up.Brewmaster Monk Guide [Patch 9.2]
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