Ability for Functional Manager to route approval to line manager

Summary

Ability for Functional Manager to route to approval to line manager

Content

Currently, we have the following Goals approval hierarchy in place. We have a requirement to enable functional manager sending the goal plan to line manager for approval.

1)Employee with functional manager adds goal.- > Approval goes to functional manager of worker -> Approval goes to line manager of worker. Line manager approves the goal

2)Line manager adds goal it is auto-approved.

3)Functional Manager adds goal currently it is auto-approved. Now I want Functional manager of the worker adds goal it should go to line manager of the worker for approval. I want to understand how should I put the code in manage approvals to route this approval flow.