How to extend object in project 2 which is available in dependent project 1 in AL

I have 2 projects in AL  Project 1 which includes plant and maintenance objects and Project 2 which includes all customized objects with 50000 series. Project 1 is dependent on project 2, and now I have to define a table relation in project 1 with table available in project 2, How can we extend the objects from project 2 in project 1?

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