As I am still on Studio, which serves my needs quite well, I post this question here though it might ultimately apply to Ultimate.

I have an IKEA frame RIBBA which will take a paper of the size 880 mm x 330 mm [there's a bit of leeway in both dimensions]. It comes with a premade passepartout featuring 5 cutouts. I want to print 5 photos onto a roll of paper [Epson 2100] such that I don't need to cut away between the pictures when positioning them in the frame under the passepartout.

The distance between the cutouts is 45 mm; obviously I can easily adjust overall height after the fact but need the four interimage distances to be precise. Is it possible with Studio - or Ultimate - to define the distance? Has anybody done something similar, i.e. for the 3-cutout RIBBA?

Thanks Fred!

Since I thought not everybody would know IKEA's photo frames I included a quick snapshot done with my smartphone; you might know passepartout as 'mat' or 'mount'

Another way to do this is in the page editor.  You can specify the distance from the either edge, top or bottom of each print.  Just position the left edge of each print at a distance equal to the previous print position, plus the print width, plus the desired separation.  I do this frequently and it works fine.