Sure @Merna_Zohdy so in terms of this:
That would just be a section in your Asana board or list view.
Now for this how it can work is with rules: https://asana.com/guide/help/premium/rules
First you would set up a single select field with all task templates you want to have (above the 10 you have already set up as task templates directly)
Give them a name
Then the next step will be setting up rules
As a trigger, you select one option from the single select drop-down field you created.
And then you can have various actions such as adding subtasks, assigning the task, adding collaborators, adding a comment and more.
As Bryan mentioned a few things are not possible at the moment but IMO it is still a good workaround.
I recommend using the real task template feature for the most comprehensive tasks that have attachments and stuff that you would not be able to set up via the rule automation for example.
Hope that helps, let me know in case you have any additional questions 