Go to  Master > MargSetup > Self format > Select invoice format-98 [DMP]/99[GUI] > Password window will be appear > Feed password as current date in reverse format (yy/mm/dd) > Format window will be appear > Click on Page setting > Click on Next > Search---"SIZE" Then click on Accept > There is one option shown Print No. of Size in a Row---User can decrease the number of size which is mention with that option(How many number of size user can printing on invoice format ) > Then press esc key for save.

NOTE:- software count one blank size number so define one extra number of size(for eg:- user wants to print 4 size so then user have to define 5 number of size in page setting)