Learn about the manual dimension snap points provided by the horizontal gird in elevation views.
Starting with Advance Steel 2019, the horizontal grid that can appear on elevation views when the "Display horizontal grid line in details" default is activated in Management Tools, provides snap points accepted by Advance Steel manual dimensions.
To activate the display of the horizontal grid line in detail drawings:
Go to Home tab 
Settings panel
(Management Tools) Defaults Drawing-Presentation General Display horizontal grid line in details.
The manual dimension snap points provided by the horizontal gird will appear at both ends of the line using the "Preferred for manual dimension" snap point.
This snap point can be part of any vertical, horizontal or sloped manual dimension.
Changes done to the geometry (relative position of the grid against the dimension elements) will reflect during update and the point will adjust accordingly.
Multiple horizontal grid lines can exist on the same drawing (from different levels) and manual points are provided on all of the lines.