Combined Employer Contribution Limits of 401k and Roth Plans.

Hi Gurus,

Can any one share your suggestions onthe below scenario.

At present my client is maintaining Employer Contribution limits for both plans (401k & Roth) seperately as 25% of the first 6%.

Now, they are looking for the combined contribution of 25% of the first 6% for both plans 401k & Roth . So that, the combined amount an employee can get is 25% of the first 6%.

Where can I set this limitations ?

Thanks in Advance,

Nalini Uppu