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This issue should be posted in the standard Revit MEP forum and not the Wishes forum. But yes, you can create a Pipe Slope Tag. Create a new Tag Family or open an existing one for editing if you wish to add the info to that one. Create a new label or select the existing one and click "Edit..." under properties. Add the 'Slope' Parameter and load into project. It will take the formatting as defined in the project. Reply back if you need more info or run into any problems...