No idea of Hebrew, so with non-sense words:

This is the LaTeX code generated with LyX (after some cleaning of non-essential parts) to produce this:
\documentclass[english,hebrew]{article}
\usepackage{fontspec}
\setmainfont[Mapping=tex-text]{Linux Libertine O}
\usepackage[a6paper]{geometry}
\usepackage{makeidx}
\makeindex
\usepackage{polyglossia}
\setdefaultlanguage{hebrew}
\begin{document}
חחח\index{חחח|see{םםם}} משפטית הספרות אווירונאוטיקה את, שער דת טיפול
עיצוב, ב לשון ובמתן ולחבר רבה. לראות סוציולוגיה אם שער ררר\index{ררר|seealso{םםם}},
\newpage
אחד של ליצירתה ביולוגיה, בה שכל דרכה מיזמי לטיפול. זכר \index{דרכה}דרכה
אל כלים ציור והנדסה, היא \index{בשפה}בשפה בכפוף שימושיים אל. להפוך בקרבת גם קרן.
על בקר תרבות פיסול, את שפות שנורו אתה. שתפו העזרה או עוד, שמו העיר
\newpage
םםם\index{םםם}
\printindex
\end{document}
Note: the above code with right to left text seems that is not correctly displayed in my browser, but it should be OK when pasted to any good LaTeX editor as texworks.
And this is how a index entry with a "see also" should look in LyX:
To produce the above code you in DocumentsSetting...Language select Hebrew
and check that Language package is set to default
(now that should load the polyglossia
package). Then in DocumentsSetting...Fonts check Use non-TeX fonts(via XeTeX/LuaTeX)
and use a font with hebrew glyphs as Linux Libertine O
.
Then write the text and index entries, using CtrlL to produce the evil red text (ERT) boxes and finally InsertListIndex List.
Ready. CtrlR to check it. If there are problems, export the file or check the Code Preview Pane and compare your code with the above MWE.
\newcommand ...
, then insert the text with the index boxes (Insert>Index Entry and Insert>List>Index list) to reproduce the example and check inView > Code Preview Pane
that code structure is almost the same to that of the linked page (specially that essentials commands as\printindex
are already there there) and then just test the code with Ctrl+R.seelaso
command? I didn't understand it from you comment.... :)|see{whatewer}
or|seealso{whatewer}
inside and configure correctly the default document language of the document, so in german "see also" will be automaticatlly changed to "siehe auch" and so on...