Override is disabled in Analysis derived from (Element Template). You cannot modify the existing analysis defined in AF template. You can way is you can use the output from the base template and use th output tag in the expression.
As Lal Babu Shaik mentioned , Override is disabled in Analysis.
But if you just have sum up the attributes of the element then you can make use of attribute categories in a Roll up expression. In this way you can have the same analysis template used for parent as well as derived element template
1. Element 1
2. Derived Element
Unfortunately you can't do this as Lal Babu Shaik and Akash Naik mentioned. Akash does provide a workaround. Another workaround is to use the excluded property and with the 2018 release you can use IsBad() such that analysis using the excluded property will not get stuck in the suspended state. I haven't been to happy with this alternative. You can read more about the feature here PI Server .
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Perhaps I am off mark but maybe this is what you are looking for?
I created a base template with 2 attributes and an Analysis output attribute
I then created a derived template from my base template and added 1 additional attribute
I also created a duplicately named analysis template on the derived template with logic to add the newly added attribute.
I then created an element based off of either template and noticed that each evaluated as I expected them to.
My data is a little out of sync just because of when I took the screenshots but I think the point is still there. Is this what you are looking for?