Datum identifiers can be attached perpendicularly to visible lines, center lines, or dimension lines. 
Add GOST (ESKD) datum identifier to drawing
- On the ribbon, click Annotate (ESKD) tab
Symbols panel
Datum Identifier 
. A plus (+) sign and a box appear beside the cursor.  
- To place the symbol, click the location or the object on the drawing where you want to start the leader. 
 
- Move the cursor to a different location and click again. The Datum Identifier dialog box appears and a symbol is displayed with a leader line to the target location. 
 
- Add one or more datum identifier symbols in the Datum Identifier field. 
 
 
Edit or delete datum identifier symbols
- To edit, double-click the symbol to launch the dialog box, or right-click to display a context menu and select the edit option. 
 
- To delete, click the symbol to highlight it, and press Delete.