Import a excel doc. into powerpoint

I have an excel document that is made up of 8 worksheets. There are formulas on some sheets that take values from the other sheets. I need to copy the sheets into powerpoint, and the formulas all still need to work. Powerpoint will let you update all of the formulas apart from the ones that draw data from another sheet. Is there a way to link the slides so that the formulas will draw data from the other slides?