Need help in updating a hierarchy

I have a table T1 which has the following columns:
Emp_ID - varchar
Mgr_ID - varchar
One EmpID can have only one Mgr ID,
One MgrId can have multiple EmpID.
Emp_ID can be Mgr_ID for some other Emp_ID.
I need to write a code in which I have to edit all the rows for the subsequent employee IDs for a manager. For example:
Emp_ID Mgr_ID
A C
B C
C D
D F
E D
F F
G B
H G
If I take an ID "C", then the code should return A, B, G and H (all the subsequent IDs in the hierarchies which have A as the topmost node).
There is no limit to this depth of the hierarchies, and can be increased/decreased dynamically from the UI.
Can anyone please guide me and tell me how to achieve this?
Thanks

Emp_ID Mgr_ID
A C
B C
C D
D F
E D
F F
G B
H G
How do you identify the topmost level in your hierarchy ?
Thanks and regards, Rishabh K

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