Multiple-Variable Functions and Plotting - New Critical Limitation?

Hi,

I'm trying to switch to Prime. Here is a show-stopper that will have me trying Maple for the first time if I can't get it resolved:

I frequently need to create functions with many input variables (sometimes over 10) and plot the results many ways. To work in a 2-D plot, I used to just set some of the variables to constants in the function name in the plot itslef. This no longer seems to work.

I tried an alternate path of using matrix subscripts, but appear to have hit the same limitation.

Show.Stopper.

Am I missing that this very critical past feature is now entirely gone?

Thanks.