I'm very new to Zoho Creator. 

I am building some apps that I want to work alongside Zoho CRM.

The first feature I need is to be able to select a relevant potential for an account that I have already selected in creator.

So I have created a "Zoho CRM" field called Customer in my form. here I will choose the relevant customer.

I then want a field (maybe a dropdown or similar) that lists the potentials relating to the customer I have chosen above.

How on earth do I do this?

Laurence