I am new to sage inventory. The client uses Smart Vendor but does not update the inventory when an invoice comes into the store. I have been putting the inventory into sage to keep it up to date on my end but the client has been using misc. inventory on their end so the inventory is a complete mess.  We did a count and I need to remove or add inventory on my end, how do I go about doing so. 

It was the year end and the accountant would like the inventory relieved accordingly and I am at a lost on how to do so. Any help would be great.