Custom Module - Adding Contacts as related item

Custom Module - Adding Contacts as related item

Hi,

I'm evaluating Zoho as a potential enterprise CRM solution for 2 clients.

I've created a custom module (Presentations), and i would like to be able to associate one of more contacts to a presentation record.

When selecting "Organize Presentation Details" option on a presentation record I'm only given the option to add "Open Activities", "Closed Activities", "Emails" and "Attachments". I would like to add "Contacts".

I can't find anyway to do this in the settings and can't find any help information on how this is achieved.

Is there a way to do this?