What is required to be included for cost support in subcontractor/consultant proposals?

When proposing subcontractors and/or consultants, support documentation must be provided for the proposed cost. This documentation should clearly support the total subcontractor/consultant cost being proposed. For subcontractor, the support must show a breakdown of how the overall cost was arrived at with items, as applicable, such as labor categories and hours, indirect rates, material costs, travel costs, etc. The subcontractor cost proposal should be clear on its author using company letterhead, from a company email address, or other such identifiable document. A description of the work the subcontractor will provide is normally within its proposal and would be its intent to work on the project. Proposed consultant cost support must be from the consultant (letter and/or email address) and confirm the number of hours the individual will provide at a particular hourly rate and an explanation of the work commitment/support the individual will provide for its proposed cost.