How can Notepad++ sort XML elements by the value of one subelement?

Question

Notepad++

I open the XML table in Notepad++.
The task is to find elements with a certain subelement parameter among a huge number of elements and subelements.
Example:
< 1>
< a>111< /a>
< b>222< /b>
< c>333< /c>
< /1>
< 2>
< a>444< /a>
Bookmarked < b> 555 < /b>
< c>666< /c>
< /2>
One of the sub-elements contains a unique number, I search for it and mark it with bookmarks (for example, b=555).
Question: how to cut out all elements (in our case < 2>< /2>) in which subelement b is marked with a bookmark?