Hi souperdouper!
You can check out hubbed.co’s shopify app here. We have a shopify app that helps you manage your bundles, alerts you on low inventory, and there is also a stocktake function to help you with your needs.
Manage Your Orders
You can manage orders easily with Hubbed’s easy status filtering.
Generate Picklist
With the orders, you can generate a picklist that helps you to pick your items easily in your warehouse.
Create Bundles
You can add products to the bundle easily on Hubbed. Hubbed does the inventory deduction and automatic counting of how many bundles you can fulfil with existing inventory.
Create and Automate Purchase Order
You can create purchase orders and automate according to date, or stock level 
Create purchase order
Inventory Insights
Get a good understanding of your top sellers, slow moving items, and top customers.
Stocktake Function
You can easily upload your stocktake file, or just key in stocktake results on our app, and it syncs directly with shopify.
Other Bonus Features
We also have features like
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expiry date management
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multi-channel integration to Shopee and Lazada
Hope this helps! will be happy to walk you through the features as it is a pretty packed app.