How can I execute TEST SUITES in robotframework in a specific order?

I have my tests set up in the following structure using Robotframework:

Directory1: 
  - SuiteA
  - SuiteB
  - SuiteC

Directory2: 
  - SuiteA
  - SuiteB

I want to execute all of the test suites from Directory1 first before executing the suites in Directory2 using "pabot". The test suites from Directory2 are dependent on test suites from Directory1 so the execution must be in this order. How can I order the execution this way?

I was reading online about using an argument file to specify the order of execution but I was not able to figure that out. I also read the documentation from Robotframework and named my test suites accordingly with the "number__testsuitename" naming convention but that did not work either.

Any ideas? Thanks in advance!