If you are the Creator/Moderator of the SubGroup, you can add/remove users for the SubGroup!
Step 1: After Logging in, go to My ADDA >> My Groups. You can see all the Groups listed.
Step 2: For the Group you wish to ADD/Remove users, click on the Advanced option. You can see Moderator, + ADD Members, x Remove Members coming up.
>> To Add users, click on + ADD Members >> a new page opens up with the users listed by block wise. Check the mark for the user to add to the group and click Add to Group.
>> To Remove users, click on + Remove Members >> a new page opens up with the users listed who are part of the group. Check the mark for the user to remove from the group and click Remove.
You can also add/remove members to/from a group from ADDA App :
Login to ADDA -> Community -> Groups -> Click on the group -> Click on the 3 dot icon at top-right corner and you will find the options add members, remove members.