Ejabberd contact list grouping and show contact list if its connected with parent entity

Question

System has 2 type of Entities,

1. EntityType1
2. EntityType2

Now system has for ex.

2 EntityType1

1. EntityType-1.1 - 5 Users - Mark wood
2. EntityType-1.2 - 5 Users - Mark wood

&

2 EntityType2

1. EntityType2.1 - 3 Users
2. EntityType2.2 - 3 Users

Now EntityType1 can connect with EntityType2. So Once the EntityType-1.1 is connected with EntityType2.1, EntityType-1.1 users can chat with its 5 users + EntityType2.1 entitys 3 users. Now EntityType-1.1 sends connection request to EntityType2.2 and got connected. So now EntityType-1.1 can chat with EntityType-1.1 employyes, EntityType2.1 users & EntityType2.2 users.

Now, Mark wood has access of 2 employers. EntityType-1.1 & EntityType-1.2. But it should show contact list entity wise. So When Mark is working under EntityType-1.1 it should show chat users of EntityType-1.1, EntityType2.1 & EntityType2.2. And when mark is working for EntityType-1.2 it should show chat users of EntityType-1.2 only.

Can somebody please guide me with the reference if known