To have a clearer view of your jobs (e.g. separating them into financial jobs, medical jobs, etc. or other categories of your choice), you can categorize them using colored labels.
First of all, you have to define your labels in Settings > Labels.
Then, to assign a label to a job, you have to click on Edit > Labels in the job concerned.
The label will appear next to the name of the job in the jobs list.
In the Quantity by service report and the Performance report, you can filter using these labels.