Trouble running Code Snippet from other project

Hi,

I am trying to run a code snippet from Project A in Project B. Ultimately, I want to run Nunit Selenium tests in Project B after Project A's test has run.

Here is my directory structure:

+Project A

   Script Directory:

      Folder Name
          Script 1
          Script 2
      Folder Name
          Script 3
          Script 4

          Unit 1

+Project B

     Script Directory:

          Script
               Unit 1 - this was imported as Existing Unit 1 from Project A

      UnitTesting
           My Nunit Test

      KeywordTests
           KeywordTest 1

In Keyword Test 1, I have Run Script Routing, with the Operation: Unit 1.

The test instantly fails with "The USEUNIT section contains a reference to "ABC" unit that was not found in the project.

ABC is defined at the top of Unit 1 from Project A. Project A has many scripts (maybe a total of 20). Do I need to copy all to project B? Or is there a simpler way?

Thank you!