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Even though AutoCAD has had the 'Multi-Leader' for ever' most AutoCAD users still place the text and leader lines seperately in the DWG.
In REVIT I do not believe there is an 'out of the box' way to just place a leader line with no text.
The answer is to create a new 'Generic Annotation' family (wblock) of 'nothing'. That's right an annotaion family of NOTHING.
Then save and load this (blank) family into your project.
Then within the project right click the family in the (PB) > 'Type Properpties...' and assign a 'Leader Arrowhead' style.
Now drag the new leader family into the editing window.
Now (in 2011), on the options bar, when you place the family you will get a choice of how many leader lines you want.
After the fact you can select the family on screen and then Add or Remove leaders to the instance.
You can also edit the 'type properties' (right click in the PB) and 'Duplicate' the family and make variations of that same family but with different arrow head styles.
I just got a comment from someone on the Student Autodesk Facebook site that said this works great for 'slope arrows' in REVIT and I tend to agree.
Here's the CADclip.