If there's a lot of jobs to be scripted, right-click on JOBS in the EM tree and then 'All Tasks' then Generate SQL Scripts. You can manually edit out unwanted jobs from the script before executing it.

Note: I also uncheck "Replace job if it exists" in most cases. This saves my hide if I were to accidentally run the script on the wrong server (not that I ever would though )

Unfortunately EM doesn't provide for generating a script for multiple jobs selected in the job list pane.