Expand & Collapse Jobs in Hierarchical View

I have numerous regular clients , with multiple jobs. I create a new job to correspond to the current year & then add individual jobs to that year as they come in. It would be a great feature to be able to expand these "year' jobs rather than show all the inactive jobs. Sometimes i may have to invoice for a previous (inactive) job & as I group according to year it would be great to just go to that year rather than have 300 "inactive" jobs displayed. That way i could keep the previous 'years' active & expand if searching for a certain job