Can I combine my data from more then one session

Yep, there sure is, but it depends what software you're using, they're all different.
Realspeed is a bit tricky, I'll try to remember the sequence.
First open your earliest file normally, then don't "open" your 2nd file, use the "import" function instead.
(File >import)

Then click the "view" button and tick divisions.
Right click over "Track Files", click on "Create combined file).
When realspeed finishes combining them, click on the combined file to select it.

I haven't tried more than 2 sessions, but I think it should work, if you import all sessions after the 1st one, tghen do the combine thing.

I have a feeling there may be a guide to this on the GTC site as well.

I also have a feeling that the KA72 site may automatically combine same date files, but not sure about that.

If you're using GPSarPro, it's a bit easier, you open the sessions normally, then in the "tracks toolbox" you can use the combine files function, it's just a matter of selecting which files to combine.

No wonder I thought that was there, I wrote it!!!

OH YEAH!!!!!!!

Of course you could also do it manually, the 5X10 is the hardest, choose the 5 best 10s results from all sessions, add them together, then divide by 5.
Distance is next, just add all distances together.
Then it's just a matter of picking the best of the rest.

Good one Dylan, I had a feeling there was some way, your site could do it.

in GPS results when you are going to open files you need to select all files but strictly in order of real timing. Click on first file, then with CONTROL click on second and third.
There is message "average files", hit NO, then "concatenate files", click YES
You will notice that number of trackpoints are summed. At this point just save trackpoint as new one sbn navi file, and that's it in GPSR
Try to open and it is working