Pittsburgh - E-marketplace MetalSite.com said Tuesday it will use supply chain technology from i2 Technologies Inc., Dallas, to offer collaborative planning to its market members. MetalSite will deploy i2's TradeMatrix planning and advanced order status functionality. They will let customers better plan and track inventory to reduce levels and improve return on assets. MetalSite.com's choice of i2 was at least in part influenced by its recent partnership deal with coalition e-marketplace MetalSpectrum.com, which also uses i2's supply chain applications. MetalSite and MetalSpectrum agreed to share customers and work together to developindustry-wide supply chain capabilities.