Vivek,
As Anime and Umesh suggest, co-products is one viable option, especially if you tend to cut the same pattern again and again. But if you mix and match patterns based on demand, you might find co-products to be problematic. If that's the case, you can consider the following approach. You actually can use multiple process orders - one for each finished pattern - and issue the sheet in units of area (e.g. square meters). This is actually fairly common. And if you are not constrained by an already configured system you can even consider using a Mill Products solution as this is the very scenario that Mill Products is designed to address.
Hope this helps.
Dave