placing elevation label on wall or slab top

[cadomatic]

hi

i need your help , 

i want to place an elevation label on top of the wall  but can't get really how it works in ACA

what a b c d means? what they really controls?

file attached

Thanks

Shay

[pendean]

Same as your other post https://forums.autodesk.com/t5/autocad-architecture-forum/elevation-labels-explained/m-p/12041055