You connect a global label to the hierarchical label on the inside of the sheet. Making the hierarchical label redundant (no need to define a connectable interface for something that is already connected)
What did you try to achieve here?
Generally if you mix global labels in with hierarchical design then you remove much of the power of this design methodology. See Hierarchical or flat schematic design, what is best for me? (How to deal with multi page schematics?)