Yes, you do it the same way as with parts, the mates and components are just features of the assembly like extrudes, revolves, etc... are to parts...
(with the design table open...)
You can double click the Parts to add the Supress State to the design table (DT)...
Double click mates and then double click their dimensions to control them with the DT...
When you double click any feature, it will add the supress state for that feature to the DT... if you don't want to control their state w/ the DT, simply Delete the column...
Tip: Use Distance mates with value of zero (0) instead of Coincident... that way you can control the distance as well as the coincident... instead of having 2 mates with one supressed...