can we offer our full-time insurance benefits to only SOME part-time p

[Guest elkor]

For our corporate employees, our medical and dental insurance benefits are fully comped; we have a few current full-timers who say they will stay on as part-time if they can maintain their benefits, even if they have to pay for them. Can we allow this? Non-corporate employees (ie, offsite) all pay about 30% of the premium cost through pre-tax deductions. We would like to ensure 1) that our corporate/noncorporate benefits differential is even legal, 2) that offering benefits to some Part timers but not others is legal, and 3) that we do not jeopardize the section 125 status of our plan. Previously we have not really dealt with any kind of tiered benefits plans, but we are running into the same questions with GEBAs and so forth now that we are growing. Help!