Customized package / a-la-carta / Ask for quote

I would like to have a free business directory package for visitors to add basic listing. I have created a free package to cater to this requirement. I want that user creation/registration should be optional. They should be able to add free listing only by providing their name, mobile and email id.

That can be done with this setting:
GD > Settings > General tab > General sub-tab > Show Advanced > Allow posting without logging in? > YES.

For paid listing, I would like to simply display features as text and provide a form (Ninja form) for user to add their choice and “ask for quote”. I shall send individual quote (using invoicing quote module) to them and add listing based on the combination they choose.

I am not sure I understand this, but you can edit the Ninja contact form to include additional fields: https://wpgeodirectory.com/docs-v2/integrations/ninja-forms/#contact

Or maybe this is the answer: https://wpinvoicing.com/downloads/quotes/

Please give us more detail if I misunderstood.

Thanks

This gives only two fields. How do I add mobile/phone?

That will require full registration then, or add a custom field to the Add Listing form itself.

If I understand correctly now, you will need to create a form that allows you to collect the user data, if it is not possible to collect them using custom fields.
Then you can create your own listing from that.
And use Invoicing items to create the invoices, instead of using GD packages.

Thanks

You can create as many packages as you like, but I replied based on your comment that “it shall be difficult to create packages for each such combination”.

Thanks