Hi Hari,

1. I have a parent case P which has default locking configured and has a child case C1. If i lock P, will it also lock C1 in default locking? -> In this case the child object will also be locked

2. If i lock C1, will it lock P as well? -> It depends on the setting you choose in the child case whether to lock the parent case or not which can be seen in Case > Advanced Tab > Do not lock the parent case when the child case is being performed checkbox.

Hope its clear for you.

Regards

Mahesh

Adding to my colleague,

OOTB you can lock a Parent case when a child case is performed.  In fact, this is the default behaviour.

Look at the Case Designer "Locking Strategy" for a subcase.  By default, a child case locks its parent.

You need to check the "Do not lock Parent case" checkbox to enable subcases to NOT lock their parent, hence subcases may be performed independently.