help with Zoho Inventory

Description

** SERIOUS OFFERS FROM ZOHO PARTNERS ONLY PLEASE **
We manufacture specialist products, which are composite items made up of various parts (nuts, bolts, etc.). To track stock, we create a bundle (excluding labor) when the sales order is created, allocating the individual items to a bath. Once the bath is built (which can take over a month), we delete the initial bundle and recreate it, including labor costs. This process has caused issues with Zoho Books and our P&L, as creating and deleting bundles constantly changes our COGS.
We tried locking down Zoho Books at the end of each month, creating another bundle for labor, but this seems messy. We're considering going back to one bundle after the bath is built, including labor time, but this means we can't allocate stock during the build. Is there a way to allocate or reserve stock to ensure timely replenishment?
I also found a report about creating two different types of composites. Ideally, if the double composite idea worked and the COGS pulled through correctly, we could move stock from 'raw materials' to 'work in progress' and then to 'finished goods.'
More details can be sent if you feel you can fix this - please provide an email address.