The Zoho Practice software is only allowing a total of 15 such clients who are not organisations in Zoho Books/Payroll/Expense. i.e. 5 organisation in each of the software by creating a new organization for them and adding the accountant as the admin in those organizations. 

Now, here's the issue, the account can have multiple clients in hundreds many of whom may use Zoho Books/Payroll/Expense and many who may not be using any of these 3 as on date. 

The accountant obviously wants a single platform to manage all his clients. 

So, there should be a way to add as many numbers of customers as client under general/other category without the need for having an associated Zoho Books/Payroll/Expense Organization. 

Please see the screenshot and make the Zoho Apps drop down list as non-mandatory. So that this tool can really reach its potential.