If you often use the same services or units when you create a job, you can pin these services and units to make them appear first in your dropdown menus when you create a job. That way you don't lose time scrolling through your menus.
To pin a service or unit, you have to go to Settings > Services and click on the little star next to the services/units you would like to pin.
Then, in the job creation screen, you will see that the 'pinned' services and units are displayed at the top of your dropdown menus, with an *.
To 'unpin' a service or unit, simply click on the little star again under Settings > Services.