Adding a subheading in an email subject line

I am trying to show only the address line 1 portion of an address field in my form. I'm not sure how to do this.

Do I need to first input the main address field then the subheader field?

{address} {input00_addr_line1}

Do I need to only put in the specific subheader field?

{input00_addr_line1}

Do I need to include the "#" that I saw in the field details?

{#input00_addr_line1}

I have all the pieces to this puzzle, but I don't know what the right combination is.

If I understand you correctly, you want to the address line 1 only to show in the Email Subject and not the whole address field. If you're referring to this form (http://www.jotformpro.com/form/71315980048962) then please use this code  

{propertyAddress72:addr_line1}

Here's the notification settings:

Also, address field can be separated and here's the code that will help you to get the value of each field: 

{address:addr_line1}

{address:addr_line2}

{address:city}

{address:state}

{address:postal}

{address:country}

Keep in mind that you will need to replace the "address" with the name of your field, this guide will help you to get the name: How-to-find-field-IDs-and-names.

If the issue persists, please provide the form direct link so we can check it further. Please do get back to us if you have questions. Thank you.

Thank you so much! This was exactly the help I needed! :D

You're very welcome. If you need anything else, don't hesitate to contact us again.

Enjoy the rest of your day.