There's a chance I'm misunderstanding your question, but here goes...
Every row has a default species but this can be different for every row. So if you add a new species by going File > Options > Custom Species, make sure you change the species for that row or those rows to that species by selecting it from the drop-down species list in the left column.
If you change a row to bloodwood (for example) and then change individual segments to other species, the species for that row is still bloodwood which simply means that if you have segments that you didn't paint, the default will print on the cutting summary so that you will know what species to use for the unpainted segments.\
If you paint individual segments, the software keeps track of up to five species (that's all the room I had available on the printout) and shows you at the right of the printout how many segments of each species are on each ring. The Ring View will show you which segments are of which species as the visual is far better than telling you what segment numbers are to be in different species. If you don't want to print out a page for each ring, I suggest looking at a neat PDF program called FinePrint. FinePrint allows you to specify how many pages are to print on a single Letter-sized page. If you select 2, those pages will print half-size and will print on the page in the landscape mode. If all you're needing is to see the location of the segments, print four-up to a page. The images will still be big enough to give you the positioning you need.
Lloyd