You can use inventory management app, here is the link with different apps you can choose from
https://quickbooks.intuit.com/app/apps/category/inventory/en-us/
The expense you are incurring for the app can be deductible as business expense.
If you don't want to use the app, you will have to keep the count of inventory of scrap left at the end of the year, boards not used this year and getting carried forward to next year as - end of the year inventory and that will also be your beginning of the year inventory for next year, periodic counting and keeping record should become practice for accurate inventory tracking.
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