As far as I know, VESTA is not capable of working with PROCAR files (containing information about atomic projections), but only POSCAR files (specifying the atomic positions, i.e. geometry).
If you want to get an orbital-projected DOS or band structure plot, I would recommend "VASPKIT" to conveniently postprocess the PROCAR file.
A R Atique Ulla Previously, there was also 'P4VASP', which, however, is not supported anymore. But one still should be able to install it from github. VASP now promotes the python interface 'py4vasp' for data extraction. Alternatively the Python library 'PyProcar' should also do the job.