Hi Steph,
Can you give an example of what you're trying to do? Are you attempting to
track cost at all? If not, you may have to create a custom field (like a
number field). I use material resources to track equipment (for example) for
earned value reporting. The resource "Type" is Material, the "Std. Rate" is
the cost per piece of equipment. When I assign the "resource" or equipment
to the task, I say 1 unit per task. I validate that the total units used in
the schedule is no more than I have assigned to the schedule (and more
importantly in stock

. However, if you use the same technique, you could
use x number of units when assigning for the number of feet or square feet
and then have the "Std. Rate" equal to the cost per foot or square foot.
For example, you create a resource named "Hardwood flooring." The "Std.
Rate" is $6.00 (you don't have to put a /foot or /hour at the end). When you
assign "Hardwood flooring" to the "Install Hardwood Floors" task at say 500
units (symbolizing 500 square feet of flooring), you'll get a total task cost
of 500 units of "Hardwood Flooring" at $3,000.
For a more advanced approach, you may be installing a lot of flooring over a
longer period of time. You can use the same approach, but make sure the
resource "Accrual" is set up for "Prorated" if you want to track cost of
flooring over a number of weeks. You can use a task Usage view to split up
the # of units being installed on a given week.
Sorry if I'm babbling... can you tell it's the holidays?
Best of luck!
Ian