Self-used inventory can be entered as an 'internal bill' - create a vendor for "yourco (internal)"
Create a bill from this vendor.
Enter a (negative) amount of items taken from stock, use the current average cost as the price
then enter and categorize an expense using the same value as above - with no sales taxes.
The total for an internal bill must always be zero - you cannot owe yourself money.
If by damages stock you mean that you want it removed from inventory:
Same process as above except categorize the expense as damage.
Both these can be also be done via "inventory adjustments" - but I find the internal bills easier to understand and much more flexible to enter and edit.
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