Show/Hide elements depending on document type field?

<a {% phone2 %} " title="Call Us"> {% phone2 %}

Are you want to add a checkbox to decide to display the field or not? Or do you just want to check if the field is empty?

{% if( phone2 == ""){""}else{"RESERVATIONS: <a href='tel:" + phone2 +"' title='Call Us'>" + phone2 +"</a>" |(identity)GlobalAdministrator%}

If I understand correctly:

{% phone2.length > 0 ? phone2 : "<a" + phone2  + " title=\"Call Us\">" + phone2 +  "</a>"  @%}

You can as well show/hide web part on a page depending of document type by putting macro into visibility field of the web part:

{%CurrentDocument.ClassName == "MyDocumentType"|(identity)GlobalAdministrator%}

I want to add a checkbox to decide to display the field or not.

@Zachary Perry that script returns:

RESERVATIONS: True

Not the actual result

I misread your question. The Code I pasted was checking if Phone2 was empty and if not, displaying the value of Phone2, which it sounds like is your checbox.

I would go with something along the lines of Peter's suggestion. You add a bool field, then you can hide or unhide that field on the admin side by doing what he said and using depends on another field and visibility condition.

You would then change the transformation (sounds like that is what you are using) to something like this:

{% BoolField ? " RESERVATIONS: <a href='tel:" + FieldToDisplay + "'>" + FieldToDisplay + "</a>" : "" %}