Can I prune a avotree top without killing the tree and on what meters
The tree is plus minis 4 meters tall
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http://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=12051
Here are some great links. Never prune from top on avocados.
http://www.californiaavocadogrowers.com/cultural-management-library/avocado-tree-pruning-basics
http://www.treeremoval.com/trimming-and-pruning/how-to-grow-and-prune-an-avocado-tree/
https://m.wikihow.com/Prune-an-Avocado-Tree
https://youtu.be/oxwSmoIZ2aU
Hope this helps!
Trim a few inches then do again each month till you reach the height desired.. This method will not be as likely To shock the tree.