Can you concatenate two community builder fields on display

Hey, I am working on creating my User profile page and I would like to concatenate two fields when displaying on the profile. For example: Address to concatenate City and State
and height in ft and inches to concatenate. Is this possible?

Yes, substitute them together in a Custom HTML field or using the Layout parameters of at least one of them. See the below for substitution usage information.

www.joomlapolis.com/support/tutorials/107-use-cases/18353-using-substitutions-throughout-cb

See the below for Custom HTML and Layout usage information.

OK, next question. I have a created a couple of fields for height in feet and inches and I want to concatenate liket this:
[cb_profile_height_ft] Feet, [cb_profile_height_inches] inches

But if there isn't anything entered yet I see the display code. How do test if a value is blank? I tried:
[cb:if cb_profile_height_inches !=" "][cb_profile_height_inches inches[/cb:if]
But that doesn't work.

Your IF condition won't work because it's not properly formatted. Please see the below substitution tutorial.

www.joomlapolis.com/support/tutorials/107-use-cases/18353-using-substitutions-throughout-cb

Note the formatting is not open to interpretation. Do not add extra spaces if it does not show a space in any of the examples as the REGEXP will not match it. Example as follows.

[cb:if cb_profile_height_inches!=""], [cb_profile_height_inches] inches[/cb:if]

If it's an integer field then you'll likely want to use the below usage.

[cb:if cb_profile_height_inches>"0"], [cb_profile_height_inches] inches[/cb:if]