Advanced Link and Fetch Pipeline Video

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The approach to linking a record after it is created would be similar to how to link a record during record creation. The difference would be that you would use the "Update Record" step. You would however, need a Lookup Record or Search Records step if the record to link to isn't mentioned in the pipeline (such as if the record you want to link to isn't the trigger step for example). If you add an Update Record step to your pipeline, you can choose to link that record to a resource.

You may be able to reference this exercise or the previously mentioned resources:
https://university.quickbase.com/build-powerful-pipelines-using-included-features/645783