Can I use code to prevent values in a row of cells from displaying? I do not want to physically hide the row or cells, I just want them to "appear" blank or clear (as if I used white font on a white background).
You could use Conditional Formatting to do that (say, hide all instances of 0 by coloring it to match the background). To hide all numbers or a range of numbers, just make the conditional formatting cover the whole range.
One caveat: If someone highlights the cells (say, with a mouse), the data will show up--dim, but perfectly clear. Two caveat: If someone prints the spreadsheet with print settings set to Black and White, those numbers will print out the same as any other number (Page Setup, Sheet tab, Black and white).
There are certain rows containing numeric values (calc results) that I want to hide 100% of the time (can't get rid of them because they're needed for other calcs). I was hoping for something other than conditional formatting to prevent the row from being highlighted & viewed...
How do I set a "custom format"?
If your purpose is not aesthetic and you want to prevent the user to see the values in the cells, a formatting solution will not do, as you can still select the cell and read the value in the formula bar.