Need Proper Manufacturing flow of t-shirt

Hello, i need help in this flow of manufacturing.
I have to manufacture 2 T-shirts. Black and white. It has 4 sizes. So it becomes 8 Products.
I don’t want to create different items for every product. How can i create one BOM of all products? Or Two Different BOM for black and white?
How to define bom of black or white as it has different sizes and different sizes will make different cost.
And also about work order. Sometimes i will get the work order of only t-shirt of one size and sometimes i will get the work order both color t-shirt of one size. And right now i have a work order to create all 8 t-shirt. How can i make one work order of this.?
Please tell me the proper flow of this.