@Harry
The two options you are referring to are separate functionalities in Acumatica.
To check the availability of a machine or work center, you can use the Production Schedule Board, which provides visibility into work center capacity and availability.
To check material availability, you can create a Planning Order. A Planning Order allows you to change the Finished Good (FG) item and warehouse at any time, making it a flexible way to evaluate material availability as needed before creating the original production order. Alternatively, you can use the Critical Material Analysis from the Planning production order to review material shortages.
Based on my understanding, Acumatica does not provide a single function that combines both work center(Machine) availability and material availability into one screen or process.