Mugarolla
Light 'em up!
I'm considering a transfer that would result in me forgoing my more than 20 years of seniority. I asked HR about this very topic two weeks ago. They said that my hire date was what mattered not my seniority date. This is in CA in the Bay Area.
That's not what your supplement says.
Your supplement says seniority date, not hire date.
Now, is this your part time seniority date if coming from the inside?
Is this your full time seniority date?
If you transfer, is this your transfer seniority date?
If I were you, I would not trust HR. Talk to your local.