No we can’t do that via Template Driven because tt uses the models for the driven approach. So, Template Drive Forms uses the Angular directives in the template to handle the forms. And we can’t handle the directives service.
For this we can go for Reactive Form Validation (https://www.agiratech.com/angular-4-reactive-forms-building-and-validating-forms/). Here you can create your custom validation and grouping validation in single CustomValidators.

Hello sir,
Is it possible to create a service in which we can keep all validation in one place and call from component whichever service is required.If yes, then how we have to pass the parameters to service and what service should return to component pls let me know as soon as possible.
thank you in advance

Welcome

good idea

Dunno how this is the first comment but thank you very very much for this helper class.