[grazianomancini]

Thank you.
This is the standard procedure

I discovered that it is possible instead:
You must :
A———-
Add the front as standard request for any standard themes putting the fonts converted by font squirrel in the child theme directory

B——–
add the font in the child css style as follow ( in my case the font is bank_gothic):

@font-face {
font-family: ‘bankgothic’;
src: url(‘bnkgothm-webfont.woff2’) format(‘woff2’),
url(‘bnkgothm-webfont.woff’) format(‘woff’);
font-weight: normal;
font-style: normal;

}

C—–
in flexform/options folder you must edit very carefully the file sf-options.php
keeep an original copy of it because if you make any mistake you will not able anymore to access the intere website.
keep also a copy of modified file because upgrades of the theme will overwrite it.
in this file you will need to add the new font family belove the standard one for the 3 custom oprios (menu header and copy )
in the line a bout 1246.
a line like this one must be added below the standard fonts:
‘bankgothic’ => ‘bank gothic’,

That’s all.
Thank you a lot for your answer