segregate person number for each legal entity

If my client have ore than one legal entity and for each legal entity want to have specific range of Person number for each new employee

as example if we have two legal entity LE1 , LE2

if we hire employee on Legal Entity LE1 will take 10001 automatic and the next employee for the same Legal entity will take 10002 and so on

but if we hire employee on Legal Entity LE2 will take 20001 automatic and the next employee for the same Legal entity will take 20002 and so on

can any one share what is the best practice on this case