Add new custom tab to details page

Thanks for that, however I couldn’t find information that answers my specific situation – I’d like to be able to add multiple custom fields to the same custom tab. E.g. I want to create a tab called “Accessibility information” and create numerous custom textarea fields like: “Wheelchair accessible info”, “Bathroom railing info”, etc. and add them to the “Accessibility information” tab.

Is this possible? (I don’t want each custom field to be shown in it’s own individual tab).

Right, I didn’t realise you could do that. Thanks!