Thanks for the detailed information and screenshot you've provided, CPI-DGCM.

I'd like to verify how you created the sub-assembly so I can walk you through from there. I'd suggest reviewing it and make changes if needed. Each item's quantity on hand will matter on the maximum number you can build. 

For more details, you can check out these references that will help you build items:

• Adjust your inventory of finished goods
• Combine your inventory items to build finished goods

Keep me posted and I'll surely help you through it. Take care and have a great day!