Sell products by weight using variants and inventory batches
If you're receiving products in bulk, but sell them in pre-packaged weighted products, you may want to be able to track the sales of these products separately but associate them back to the same batch from which they came from. You can also use
Here's an example. This shop receives hundreds of fresh mussels each week and sells them only in 2, 10, and 20 lbs. These are 3 product variants, however, they can all be associated back to the batch that the order was fulfilled from. 
You will also need to use our sister app Simple Bundles to be able to sell the base product (e.g. Fresh mussels per lbs ) in 'bundles' sold at 2, 10, and 20 lbs. In my case, I have 1 base product from which I would track my batches and 1 product with 3 variants as my product 'bundles' as shown in the illustration below.
Setup
1) Create the base product in Shopify. In this case, I want to track my products by per lbs. Make sure that Track quantity is enabled. To make sure that this base product does not appear on your storefront, unselect all sales channels from the Sales channels and apps section.
2) In your Freshly app, find the base product and create a batch with the quantity available. In my case, I've created a batch with 100 lbs of mussels.
3) Create another product in Shopify that you will later assign as your bundle product in Simple Bundles. For a quick tutorial on how Simple Bundles works, watch this video. Add variants 2 lbs, 10 lbs, and 20 lbs.
4) In Simple Bundles, select Build bundle. Find the product that you built in step 3 and select the product and its variants. 
5) Now you can start building your bundles! As soon as you create your bundle from step 4, you can select Add product to add your base product to each of your 3 bundle variants. Select the base product you created in step 1.
6) Once you've added the base product, adjust the correct quantity. Since my base product contains 1 lbs, my 2 lbs 'bundle' variant will contain 2x the base product. Adjust the price to reflect the price you want to sell the bundle. Now, I can do the same for my 10 lbs and 20 lbs variant.
Simple bundles will keep track of the correct quantity across all 3 bundles so that I never sell more than the amount in my batches from my base product.
What you see after a customer orders
If a customer orders 10 lbs of Fresh P.E.I. Mussels, I'll see that in Shopify, the base product has been added, along with my bundle product.
In Freshly, I'll see that 10 lbs of Fresh P.E.I. Mussels has been assigned to the original batch I created in step 2. If I click on my batch, I can see that only 90 lbs of mussels are left since I started off with 100 lbs.
If another customer orders another 2 lbs of mussels, I can still track these orders from the base product batch.
As always, let us know if you have any questions on chat or through email and we'd be happy to help you get your products set up!