[AlexisGaitanis]

One thing i forgot to mention,if you are lucky the parts you want to remove are not incorporated,in this case   in object  mode select all,then in edit mode->mesh->separate->by loose part .Return to object mode select the part you want to remove and if you are lucky you delete  and it goes away.
If the object contains seats and other objects do you know how to use other objects(cube or cylinder) for this purpose?