Level is building story

If a level is set to be a Building Story it is recommended that this level is copy/monitored from a file that is the host for all project levels and grids.

Autodesk help: Best Practices: Copy/Monitor

Grids

It is recommended that Grid lines are copy monitored from one source file to make sure every file is using the same position and naming. Using the copy/monitor functionality will also notify the user when changes are made to the source file. Grid lines that are being copy monitored will show an icon when selected, see image.