Yes, if you manage multiple accounts in Wave then you can create different Zoho Books organizations i.e., one for each business.
Notes: Zoho Books’ custom Wave plan is applicable for a maximum of 5 Zoho Books organizations.
Custom Wave plan will be activated automatically only for the first Zoho Books organisation created from the referral link. If you want the Wave custom plan for other organisations, please contact firstname.lastname@example.org
and GST filing.