Multiselect Fee field for specific user group?

Hello,

I would like to create a Checkboxes + MultiSelect Custom Field Type as described here: membershipprodoc.joomservices.com/basic-...ds/custom-fee-fields

First, I can't find how to the "Multiselect" option field, please guide me.

Second, I would like to customise it for specific users and Subscription Plans. If I follow you example with Basic, Silver and Gold members, it would go like this:
Only Silver Members can see and tick the "Gold Member" box to pay an additionnal $20 and become Gold Members. Then, they are automatically become part of a "Gold Members" Joomla users group.

How can I do that?
Best regards.

Hi

1=> To make Multiple Select field type, choose List in Field Type parameter and set Multiple parameter to Yes

2=> I think it is a combination of custom fee field as you figured out and this feature from Custom Fields membershipprodoc.joomservices.com/basic-...ign-to-joomla-groups

Please read document, then try again and let us know if you have other questions

Regards,

Tuan