Besides just having labor and material categories, it would be helpful to add subcontractor, equipment rental, and an other category. That way the job expenses are isolated to their respective "cost buckets".

And... there should be a default setting to map each one of these Cost of Goods Sold (COGS) into the QuickBooks chart of accounts as a Cost of Goods Sold (COGS), rather that just a Job Nimbus expense. This helps when job costing to determine what part of the job made or lost money. Without this, it is difficult to reverse engineer the estimate vs actual number for the job and create a Work-in-Process (Matching Revenue to the Percentage of Completion) report at the end of each month.