The highly anticipated 'Create Shopify PO using IFH forecast with the Chrome extension' is now live in the IFH app!
You can download the chrome extension. Then just select the products that need reordering and click on 'Create Shopify PO'.
Regarding seasonal forecast, app has preset 'Same month last year' that helps you to get forecast based on your last during same period last year.
Regarding Bundle products, we understand that you might customise a Bundle with SKUs of products A & B.
You want the reorder quantity for a Bundle product as a whole, considering inventory of two separate SKUs of different products that makes the bundle.
Sorry, as per current functionality, the app will treat each product/SKU as a separate individual product.
I think you might need to use your Bundles app for this use-case, which is available at Shopify's app store.