Thanks for writing in!
There is currently a way in MultiPing to reorder your timeline graphs to match your target list; just right click on any timeline graph and select the "Sort to match target list" option.
If you're needing to sort your target list - there are a few options available on this front. You can click any of the top graph headings (IP, DNSName, Avg, etc) to sort the list by any of those settings.
There isn't currently a built-in method to sort the target list with a custom order; but there is, however, a bit of a workaround that can help you accomplish this. You can right click on any target in the upper graph, select "Rename selected target," and give it a title that you'd be able to sort as needed. For example, "Home Router" could be titled "#1 - Home Router," and then when you choose the option to sort by DNS name, this target would show up at the top of the target list (and then you can title other targets with a "#2," "#3," and so on to get everything in the order you need).
Hopefully this helps out! If you have any questions, need any assistance, or if you had something different in mind here - please don't hesitate to let us know.