We can add the templates for Category page, PLP, PDP,Home page ,Information item and related cell in the netsuite. For that navigate to
Setup>Site builder>item/category templates>edit the template we want.
For applying this template to netsuite we have certain method.
One of the method is,
1.Setup>site builder>setup website
2.In the appearance subtab you can add the template for PDP in the item drill down template.
we can add template for PDP directly in this for others select the corresponding layout of categories,item list related cell etc.
3.In the layout we have a field to enter the template.In that field choose the saved template.
Another method
We can choose a template in the theme that we have selected for that site.
For that,
1) navigate to setup>site builder>theme>edit the theme
2)Select the template for item drill down(PDP),for others select the layout.
If we are adding template via theme in website setup in the field of layout and template select from theme option.
Note:We can also customize the template without using these default template provided by the netsuite.