Form - Select particular level members

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Hi Team,

Is there any way where we can select members at a particular level in form?

We have such hierarchy in system - 

Parent4

   Parent3

       Parent2

         Parent1

           Level 0 member

We wish to select Level 1 i.e. Parent1 on forms. This is just an example, we have a big hierarchy. Let us know any suggestions to tackle this that could accommodate new members that could get added in the future. Thanks in advance.