In addition to the sample varchar templates that OpenROAD provides, you can design your own templates. For example, you might want a template that limits entry in a particular position to one of three characters.

To create a custom varchar template, you can use any combination of the predefined special characters, user-defined special characters, and customized character sets. OpenROAD lets you define up to 12 different custom character sets in a single template.

After a custom character set is defined in a template, you can use it any number of times in the template. Combining custom character sets, constant characters, and the special characters gives you full flexibility in creating a template that suits your needs.