I am using predefined tags(as primary) while creating a new topic, now i want to add another tag input field(as secondary) where user can type and it will generate new tag. Is there any such plugin or way out to do so ?
@Thadeusz-Lay coz they may not want to use your theme. Making it a plugin will enable anyone to use it with any theme. If you want to keep things simple and don't want to publish your theme with custom fields, then you can add the fields in the theme.