I thought it was easier, something like vba in excel

Well… it isn’t exactly like that, but programming is programming is programming…

As an example of how “easy” it is, I’ve coded up your request into a PythonScript that I called SearchCurrDocForClipboardTextThenCopyMatchingLines.py :

# -*- coding: utf-8 -*-
from __future__ import print_function

import inspect
import os

#-------------------------------------------------------------------------------

try:
    editor3h  # third editor, hidden
except NameError:
    editor3h = notepad.createScintilla()

def clipboard_get_text():
    editor3h.clearAll()
    editor3h.paste()
    retval = editor3h.getText()
    return retval

#-------------------------------------------------------------------------------

class SCDFCTTCML(object):

    def __init__(self):
        self.this_script_name = inspect.getframeinfo(inspect.currentframe()).filename.split(os.sep)[-1].rsplit('.', 1)[0]
        text_to_find = clipboard_get_text()
        if len(text_to_find) == 0 or len(text_to_find) > 2046:
            self.mb('Inappropriate find-what in clipboard')
            return
        regex = r'(?-is)^.*?\Q' + text_to_find + r'\E.*'
        matches_list = []
        editor.research(regex, lambda m: matches_list.append(m.span(0)))
        line_content_list = [ editor.getTextRange(s, e) for (s, e) in matches_list ]
        editor.copyText('\r\n'.join(line_content_list))

    def mb(self, msg, flags=0, title=''):  # a message-box function
        return notepad.messageBox(msg, title if title else self.this_script_name, flags)

#-------------------------------------------------------------------------------

if __name__ == '__main__':
    SCDFCTTCML()

What you’re describing I don’t think is possible with only the use of macros. It is much more achieveable with scripting, but not sure you’d be comfortable with such a solution (requires the use of a scripting plugin and some programming – which we could help you with). If you want to go that route, let us know.