You have to implement structural authorizations in order to do this. I cannot go into enough detail here to explain how this is done because it could be a significant project depending on how big your organization is among various other factors.
If you want a really simple method that would just do this and nothing else I suppose it would be possible to use the structural authorization BAdI HRBAS000_STRUATUH and restrict users based on their business area. This is a possibility but not the recommend solution and should only be used in cases where requirements are extremely straight forward and rigid.
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