email address for shipping address included in order notification to admin

Hi,

You can add such tag in the HTML section of the email when you edit it in the menu System>Emails: {VAR:shipping_address.XXX}
where XXX is the column name of your custom address field.

Hi,

There is no setting to restrict a custom address field to only one type of address.
This requires the billing and shipping addresses to be separated by type and this was not the case until HikaShop 3.5.0.
That's something we did with recent versions of HikaShop and so that's something we'll be able to add in the future.

Regarding the tag, you can add it in the HTML area of your email via the menu System>Emails as I was saying.
Where you add it in there depends on where you want it to be displayed in the email so I can't tell you precisely. I would recommend to try some locations until you get it at the place you want with a few tests.