Hi!I want create new Autocad menu bar "Section" (like: File, Edit,...) Under "section" is list with beam section type HEA; HEB; UPN....  under each this section name is correct section. And I can insert in drawing this beam section as block or region.Example: Section-> HEA-> HEA300 and in draving is 2D beam sections

You have not given your AutoCAD version but for most versions you can [CMD]MENULOAD[/CMD] a custom .MNS file which contains something like:
[CODE]***POP15[Section][HEA]^C^CmyCommand1[HEB]^C^CmyCommand2...[/CODE]