Warehousing & Stock Management

I would like a stock management software for my band merchandise business. We manufacture and handle online /event /retail sales. A common challenge is that we sell from the same stock when it comes to any sales incurred. In the instance of events, ie. 100 t-shirts in stock room We send out 50 for sales, 30 come back i.e. 20 sold and 70 left in the warehouse. We will subsequently create a sales report for the band by logging in the above figures. This transaction, should be seamless and not interrupt the online store sales. i.e the 100 tees we have consist of S(20), M(20), L(20), XL(30), XXL(10) = 100 the 50 tees we will send out consist of S(10), M(10), L(10), XL(10), XXL(10) = 100 This leaves the online store with XXL (0), and the online store should put that size on hold /de-active When we return the stock, and we have XXL(2) left, the XXL is activated again. My current store is built in Magento, so maybe Magento has something similar to this?