Hi @unbornink ,
We recently launched an app Material Manager to help managing inventory for stores like yours. It allows you to enter your raw materials and then specify how much of each raw material each of your variants need. The variants inventory levels are then always updated to the maximum that can be created based on the inventory of the raw material.
In your case you would enter each a raw material for each of your blends and then choose a unit of either g or kg. Then you would assign the weight needed to each variant. For 250g if you use kg it would be 0.25kg, or simply 250g if you use grams.
If you blend you coffees after roasting you could also sell single origin and different blends drawing down from the same inventory.
Feel free to reach out if you have any questions.