We also want to sell T-shirts when booking. How to do it?

To do this, use fields of type Ckeckbox or Number. The Checkbox in one booking allows you to select one item. A field Number will select several units of goods.
Open the resource configuration. Create a Checkbox or Number field. They are configured identically. Enter a name. Insert the Paid flag and specify the cost per piece. If necessary, upload the image. Save.
On the widget, the checkbox field looks like this:
And the number field looks like this:
Look in action and choose the right option for yourself.
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