Hi Dev,
Your requirement seems like item assignment block to item over view page relationship.
You can use component usage and navigation links concepts to achieve this requirement.
There is similar functionality existed in sap standard system. Check the component BT115QIT_SLSQ and view ItemsOV. Here we have a event called EH_ONNEW, which is used to create a new item by navigation to item overview page.
New button is displayed as a toolbar button in an assignment block, once user clicks on it system will navigate to overview page of the items. I hope your requirement also similar to this one.
Let us know if you need more clarifications.
Best Regards,
Dharmakasi.