a “non-displaying comment” field

I have a contact form 7 page that the members of our local beekeeping club use to pay their yearly registration dues.

From Jan 1 through June 31, everyone pays the same amount (ie both new members and existing members who are renewing). From July 1 through the end of the year, existing members (who have not yet renewed) still have to pay the full $25. But new members get the choice of paying $25 for the current year, or $37.50 which covered the remainder of this year plus all of next year.

Currently my contact form has this code (left over from last year):
[select* MembershipType include_blank "Renewal - $25|25" "New (current year only) - $25|25" "New (1/2 year + next year) - $37.50|37.50"] </label>

I would like some way to leave this code – and simply comment it out and add another section below with
[select* MembershipType include_blank "Renewal/New - $25|25" </label>

So… is there any way to comment out a section of a form code?

The page I need help with: [log in to see the link]