Define the build rules for how the new file type is to be compiled.
Select Tools > Specific setup > Edit Build Rules.
Use the duplicate button to make a copy of the 4PRG build rule.
Edit the build rule to match your new program definition (4srt).
Save.
If your modifications include an image other than the default, copy the image file to the
folders in the $GSTDIR/images directory. See Image directory structure.
You can now use your new 4SRT entity in your BA diagrams.