The answer to this question depends on the type of Bundle as A Product (BAP) you have created.
When creating a BAP, you have two ways to set it up. To have it added to the cart as a single product (Single-BAP) or have the items in the bundle added to the cart (Multi-BAP). We will describe how changing the SKU differs in these two cases.
To read more about the differences and features of each type, please refer to this document:
Single-BAP:
When you set the Bundle as Product setting to the second option, the Bundle as Product becomes a Single BAP.
As you may know, SKUs are defined for each variant. The variants of these products (Single BAPs) are the set of all the possible combinations of the variants of the included products.
When the Single BAP is created, we assign a random SKU to each variant of the BAP. You can change these SKUs to what you want them to be and have those new SKUs appear on the order.
How to change the SKU?
Click on each variant, and change the SKU for each variant to anything you like.
Will the SKU be updated after I make changes to it?
This SKU won't be changed unless some special cases happen. We have mentioned them all in this article.
Multi-BAP:
When you set up the bundle to be added to the cart as included products in the bundle, we call this product a Multi-BAP.
In this case, Fast Bundle makes a default SKU for it in the Shopify panel.
Don't change the dummy product's SKU
The Multi BAP is not a real product, in the sense that it does not have any variants, and its inventory is not tracked. The reason is that this is just a dummy product, and it isn't intended to ever be added to the cart, bought, or appear on the order. Instead, if added correctly through the ATC button on the product page of the BAP, the included products will be added to the cart and therefore, their SKUs should appear on the order.
If you change the dummy product's SKU it will bounce back after a while.
The SKU of the Multi-BAP should never show up on the order.
If your BAP is a Multi BAP and you do see a random SKU on the order, this means that the BAP has been added incorrectly and you have a problem. We call this an Invalid BAP, which means that the dummy product has been added to the cart instead of the individual products. Contact Support or read this FAQ document to address it: Explaining Invalid BAP