I'm trialing Zoho and am trying to calculate our total contract value for each Potential. I used the Formula field in the Products module without issue, but now when I go to set up a custom field under Potentials, Formula isn't an option on the left side menu.

I'm unsure if a) this is a bug, b) it's a limitation of my trial or c) Formula just isn't available for Potentials period.

Can anyone help? 

Thanks so much!