Please also study content management systems. All of them include templating systems that are far more flexible comprehensive than Dreamweaver's scheme. Some are available at no charge, others for money. Some are well supported, others not so well supported. Some have many pre-built templates available, others not so many. Additional templates are easy to add to some of them, not so easy for others.
I have a favorite CMS, but I hesitate to name it on CoffeeCup's forum. See my e-mail address at the bottom of this posting if you would like to contact me regarding it.
Yes, I looked just like that in 1962.