Silly me...
Well , I need to include php files evrywhere in my customized template file.
For instance in my template.html , I need to include a fiel called menu.php , which itself contains in its code another include , like a cascade of incldues if you want.
I've tried a couple of methods I've seen on the forum , but so far in vain.
Would there be any generic method so that any php code is interpretated in the template file ?