Save a part of my model as a component

[Aerilius]

Double post, please avoid that, and see here:

How do i save my models to a folder

To save something as a component, that something must be a component first. If the table is a group, select it, right-click → Make Component. If the table is made of edges and faces, select them, right-click → Make Component. Right-click on the component → Save As… (actually it is saved as a moel, which can be imported as a component.)