Each order your enter into the software can have a "Source" chosen for it, so that you can later generate reports that tell you which advertising sources are working for you.
The list of Sources that you use is defined on the Source Setup screen, from Misc/Setup > Sources. Here you give a description for each source you use and give some idea of what that source costs you, either as a one-time cost, or as a daily, weekly, or monthly cost.
Once this list of source is defined, then on the order entry form, you will notice a drop-down box labeled "Source", where you can choose an item from your list.
Then on the Reports screen, in the General Sales folder, there is a Source Performance report, on which you would have criteria like:
Order Status is exactly Done
AND Date for Reports is between [whatever date range]
and then you would see the list of sources and the sales they brought in for you in that time period.
Also, to see a list of specific orders for a certain source, you can run the Invoice List report with the criteria:
Order Status is exactly Done
AND Date for Reports is between [whatever date range]
AND Source for Order contains [whatever source description]
source report advertising report source advertising tracking sources track source tracking advertising track advertising
