Yes it is a technical vocational subject. 

Now according to the definition vocational subjects are those which are not purely academic but which involve learning skills, useful for a particular job. Food technology, graphic design, travel and tourism. 

Like wise computer science is also a technical vocational subject. 

hi aspirant.

The feild computer science is not a vocational subject when it comes to the academic studies no subject will be coming under vocational but some subjects may be unrelated to the respective feild but every thing you learn will be helpfull in career.