If the area does not break across a page (and I doubt it does), then you should be able to use multiple portals. You just need to set Format, Sliding/Printing to Slide up, with [x] Also reduce size of the enclosing part. You must do this for the entire portal(s) and its contents. Blank rows at the bottom will be removed. You have to go into Preview mode to see the result.
Sliding sometimes seem a bit of a black art, which can be pretty frustrating if things go wrong, but pretty cool when it works.
There is another method, which requires FileMaker Pro Advanced, as it uses a custom function (actually 2), GetRows, available at Brian Dunning's site (he hosts a master list of many people's uploaded custom functions).
GetRows produces the data that is in the portal within a calculation field (of the parent table), as text; you can insert tabs (into the calculation) to separate it, then format the tabs on the layout so it looks good (also a bit of a black art). If you stack the calculation fields you get the same thing as multiple portals, but as text; can be inserted as a Merge field(s), which will even break across pages without getting their little heads chopped off :-]