When you call readtable (or readmatrix or readcell) you can specify a range. I think the range has to be contiguous (i.e. you could grab row 32 columns 6 to 12.
Having said that, it's probably easier to just read in the whole row. That's still less than reading in the whole thing (though you can check performance, my guess is it makes little difference):
a=readmatrix('foo.xlsx','Sheet','Sheet1','Range','F32:L32');
a([1 3 7])
% probably easier to read the whole row in:
b=readmatrix('foo.xlsx','Sheet','Sheet1','Range','32:32');
b([6 8 12])
% readtable version
c=readtable('foo.xlsx','Sheet','Sheet2','Range','33:33');
c(:,[6 8 12])
