Custom fields

A

Anonymous

Hello,

I need to have a custom field representing SPI and CPI values calculated as
on day that is a week before the status date. I may further create schedule
and budget indicators as on a week before date. This is basically needed to
do a comparative representation of the current indicator value versus that
what was a week before. Any idea how to write a formulae for such custome
field?

Thanks.
 
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