Explanation
Reserve the same batch for a sales order
Same batch reservation lets you reserve inventory for a sales order line against a single batch of inventory. For example, a customer who orders wallpaper can request that the whole order be filled from the same batch or lot, to avoid inconsistencies among the rolls. To set up a product to use same batch reservation, the following settings must be active in the item model group, tracking dimension group, and storage dimension group that you assign to the product:
* Item model groups - The item model group must have the Same batch selection and Consolidate requirement fields selected in the Reservation field group for inventory policies.
* Etc.
Reference:
https://docs.microsoft.com/en-us/dynamics365/supply-chain/sales-marketing/reserve-same-batch-sales-order