Linking multiple products to custom field on Entry

I am setting up an entry form and I have used custom fields like in the documentation.

When associating a product with a field it seems that you can only add one product.

For example:

Sunday Lunch - select yes or no - if yes is selected the sunday lunch is added as a product.

I want to add multiple products to a multiple selection eg:

Lunch - choose Mon/Tue/Wed/Thu - if mon selected then 'monday lunch' is added, if Tue is selected then 'Tuesday lunch' is added as a product.

Can't seem to do this - any help appreicated

Hi roojai,

The easiest way is to create a new category, and limit the custom field to this category, then add this category to each products where this custom field is needed.

Can you please go a little more in depth? I have the same problem. I'm allowing guests to sign up for an activity on a certain day. They have a choice between Spa and Golf. The Spa product also has a few variants. Spa and Golf have been assigned to the category Thursday. I have an entry custom field that asks if they would like to sign up for an activity with a drop down of the values yes and no. The value yes is set to correspond to category Thursday. However, at no point is the guest given the option to choose between Golf and Spa.

Any chance you can help?

Thanks for your response. Why wouldn't it work? Because the product has variables? What i would rather do is just have an entry custom field for activites with a drop down with the activity choices. I've tried associating a category to an entry custom field, and it just defaults to a single product. Can you give a step by step and some screen shots? Thank you.