In SSMS you can select multiple Jobs to be "extracted" into a single script:
- In "Object Explorer" select "Jobs":

- Press "F7" to open "Object Explorer Details" (you can also open it via View->Object Explorer Details):

- Select all of the Jobs you want to export and right click to bring up a pop up menu. Select "Script Job As" and so on.

P.S. This trick works for many things