Step-by-step instructions
Log In to your google account & Search your business on Google Search Tab.
Alternatively directly Sign in to your Google Business Profile.
Now, Click on the "Edit services" option under your Google Business Profile.
Under the Services, Click on "Edit" button to add the services.
Google will prompt a few options you can select amongst them & also add custom services.
Now, to add more service options, Click on "Add custom service".
By Clicking on the "Add Custom Service" button, You can add multiple services.
Once done, remember to click on the "Save" button.
Once you have added all the services, google will review it & publish on your Google Business profile.