Block some plugins or template

Hi, my friend

Your plugin blocks all update requests.
We customize some plugins and templates at the customer’s request.
I want to disable updates to some plugins or site templates.
That means I want to put part of your code inside the main plugin file or template function file. I generally need a code for the plugin and a code for the template.
Can you guide me with your codes?
I do not want to use other plugins like (Easy Updates Manager).

Thank you