Safe Harbor 3 Tier Match

[DPSRich]

Client has already deposited the 4% Safe Harbor Match. The next tier is a 6% Discretionary Match. Client only wants to deposit $20,000 of the $29,000+. Can he do that? If yes, can he just allocate by a set percentage or by salary amounts, which would be discriminatory very much in his favor.

Thank you in advance for your help.

Dpsrich