How do I disallow negative numbers in a selected group of cells (i.e. only allow values greater than or equal to zero)?

I have a table of calculated values in Numbers, and I want to disallow negative numbers in the entire table. Any numbers that would be negative I would like changed to/displayed as zeroes, that way future calculations that may be based on this cell use the value of 0 for the calculation rather than the negative value. I have seen ways of doing this to single cells at a time, but I am interested in applying it to a large selection of cells.
There is the Conditional Format option when you bring up the inspector, but I cannot get a custom rule to work for me. I select "Greater than or equal to" and I enter 0 in the box, but nothing changes. Can anyone help with this?
Thanks

A step toward simplifying the application of MAX to the issue, Jerry.
This part, though:
Now apply your long, animal-modeling, expressions to this new, interposing, table rather than the original.
may still leave several references to be change from the original data table to the new one.
One way to get around that is to use the Duplicate ("DATA-1) as the new table for raw data, and the Original (DATA) as the interposing table, using the formula =MAX(DATA-1::A2) as above, starting in DATA::A2.
This way, the long expressions could continue to reference the original table (with its content now modified).
ALTERNATE process:
Find/Replace could also be used to speed the process of reassigning the modeling expressions to the duplicate table, as suggested by Jerry. But some cautions apply here.
Find/Replace can be limited to Formulas only, but not to Some formulas only.
Find/Replace can be limited to the Current Sheet only, but this can't be combined with Formulas only.
More on this later, when I've had a chance to check some possibilities.
Regards,
Barry

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