This video demonstrates how to setup a new multileader style and create a multileader for the purpose of adding balloon numbers to drawings. From the mechanical browser, right-click the annotation view to balloon and select Create Balloons.Click Annotate tab Balloon panel Balloons. Find; Examine the prompt and verify that the current BOM setting is correct. In this video I'm going to show you how to use the leader command or what we call multi leader. AutoCAD Mechanical 2019 Detailing Symbols and Notes. Place a balloon liters in paper space on the assembly layout. Engineer shall fill out a MAT109 to accompany the cores.