To begin a new release for a file you "get" it with the next release number.

   sccs get -e -r release_number filename

For example for a file with a version of 2.4 you would want the new release to be 3.

   sccs get -e -r3 sect1.txt
   s.sect1.txt:
   2.4
   new delta 3.1
   20 lines