I feel like this must have been asked about, but I did a quick Google search and couldn't find anything on it. Is there a way to add a "Line 2" for an apartment number in the Custom Field "Address" ? I can't seem to find how to add this in, I am assuming if it isn't built in then I would need to add another custom field and call it Line 2?
If you refer to the address type of field that is available with Toolset Maps, then the address is a single line of text based upon results returned by the Google Maps API (or Azure, if using that).
Otherwise "address" fields are just text fields, and you can structure several fields however you want (e.g. separate fields for address-line-1, address-line-2, town-city, region, country, etc.), or you could use a multiline text field where users enter a freeform address.