You assign rebar schedule marks to rebar and rebar couplers for the scheduling and organization of logically grouped reinforcement. 
 Enter or add a schedule mark to rebar or rebar couplers 
-  Select all rebar instances, rebar sets, or couplers to be marked. To select multiple instances, hold down the 
  CTRL key while selecting. 
- On the Properties palette, find the Schedule Mark parameter in the Construction section. Enter a new schedule mark or select a mark from the drop-down. 
  Note: New schedule marks are available for all rebar instances in the project. 
   
Selecting all rebar with similar schedule marks
- Right click a rebar instance. 
- Click Select Rebar by Schedule Mark from the drop-down list. 
  Group the selection or mass edit using the Properties palette. 
   Note: By default, the lowest numerical schedule mark available is assigned to the rebar. Typically, this mark is 1, though modified projects can be different.