Amending a Wrap Plan

[waid10]

My company has wrapped many of its welfare benefits. The basic plan document is the wrap shell, with the individual benefit programs SPDs as attachments to the plan document.

Now the company needs to amend some of the individual benefit programs (i.e., we need to change the elimination period for long-term disability). How, logistically do you create such an amendment? The wrap shell doesn't go into elimination periods, but the attached LTD SPD does describe the elimination period. So, would my amendment be to the overall Wrap Plan, but just reference the portions of the LTD SPD that are being changed?

Please help.