Yes, you can create classes in pascal and use all the features that Object orientation has to offer. (Delphi and free-pascal are both "Object pascal" compilers which support OOP)

But as far as I know OOP is better than procedural so why would you want to revert?
Well, many people say that it's better, but we can put some question marks there. There are still cases where the procedural approach is better than the OOP approach. There is actually no such thing as "better". Most people prefer OOP nowedays. And no, I don't want to revert. I simply would like to know how to use procedural programming for a big project, without getting lost.