We don't know how to structure what we're claiming

The pile holds three different kinds of money that get argued three different ways: measured work, which is arithmetic against the contract's own pricing; variations, which stand or fall on instructions and records; and loss and expense, which needs cause and effect shown rather than asserted. Blended together they weaken each other - the arithmetic gets dragged into the argument, the claim gets priced like a measure, and the whole account reads as a number to be haggled rather than a case to be answered.

Separation is the discipline: each head in its own section, priced on its own logic, carrying its own evidence, so the strong parts get paid while the arguable parts are argued. The structure template is that separation ready-made - and it has a second use well before the account goes in: sorting the pile early shows which head each cost belongs to while the records that prove it can still be found.

If you would rather it were done for you, Final Account Assembly, Negotiation & Agreement is the service that does it.