Actual result:

Factory can't assist another factory or unit (army).

Expected result:

Factory can assist another factory.

For example we have factory A and factory B.

Factory A have repeated built query with Medics.

I select factory B, then right click on factory A. Then factory B help factory A to build its query.

Units built in factory B go to rally point of factory A.

Factory can assist unit.

If I select factory and right click on unit - every unit built in factory should follow to specified unit with "Guard" command.

Factory can assist army.

If I select factory and right click on army - every unit built in factory should join specified army.

Goal of this feature - get rid of some annoying micromanagement and allow player to focus on more interesting things.