The sticky Z lock

Want to make all your data points land on the same Z value - even if you're snapping to other elements? Just turn on the Sticky Z Lock in your AccuDraw's properties! This setting was made available in MicroStation V8.

When AccuDraw is active - hit the spacebar if not (ESC-Spacebar or F11 if not in "Home Focus")  - you hit the Enter button for a "Smart Lock" before the Sticky Z can be activated (shortcut toggle to switch on/off: LZ).
You release the Sticky Z with another LZ and Enter to draw on on a different Z again 
You see a smaller rectangle in the AccuDraw compass as long as Sticky Z is active.

 (This is hard to see -or nearly invisible - with some background colors!)

Follow this Link to a How-To-Video on Sticky Z ...

The graphic below is a snip from MicroStation V8i SELECTseries 1 (Settings>AccuDraw)