Need Excel template that can help maintain prices of different items on as and when change

For Projects, we need to procure multiple items.

Need to maintain INPUT PRICES of different items involved in a project ( manually )

Need to maintain such input prices project wise so as to ascertain margins available after billing is done & keep the historical data.
We can use different sheets in excel file for different projects
Our billing software does offer option to maintain purchase prices, but these are constant and we need to maintain input prices for each and every project and input prices keep changing periodically.

Hope I am not being complicated.

regards / Jagdish