Importing Your Own Property Code
If you have a unique code for your property that you want to import into Pebble, you can bring your unique property codes into the Property's property fields.
In this article:
Importing Property Codes
Add a custom property field and name it. Some examples are Property Code, Property ID, etc.
Here's an article explaining how to Add a Custom Property Field.
Once your custom property field has been created, you can then upload your list when creating a campaign.
You can then map the unique property code column header from your list's spreadsheet to the custom property field you have created for your code: