Supporting Made to Order Products
Yes, simply ignore the "To buy" recommendations for the finished good, as you will not need to buy in advance finished good stock.
What settings should I set on Shopify for these Product?
Set available stock on these products to "1" on the Shopify
And unselect "track quantity"
Set "Lead Time" on Prediko to 0
Check here on the status for "Made to Order" Products for Raw Materials planning: https://help.prediko.io/en/articles/9503691-quick-start-guide-raw-materials