Techniques for managing and estimating supply costs, by drilling down through detailed component lists of tree structured component specifications and rolling up pricing estimates based on predetermined, projected and available criteria and automatically accounting for costs in an organized manner. The costs may be analyzed from a historical perspective, accounting for future costs based on historical cost data within a given past or future date range. The costs may also be analyzed based on average costs of available costed items. Quotes can be received from suppliers for use in estimating supply costs. In addition, scenarios such as partnership splits, where multiple suppliers manufacture and supply common components to buyers at same or different prices, can be taken into account.