solution for a problem statement I need to implement

Certified Associate Developer

loan application flows to the Manager to process it further. The manager has 3 sub-ordinates to whom he assigns the applications for further processing.

Requirement#1: As a manager, I should be able to configure the percentage allocation for each staff members.

Requirement#2: As a manager, I want the system to auto assign the ingested cases(requests) to the staff members in the configured percentage.

where to start and what to do to implement this .. like can anyone please guide step by step for this 

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