I have one idea like this: I create module. in module i create many field, but I want field i create add many type as : file, text, select,..no way to towards this does not? thank you.
I am not quite sure what you're referring to exactly - but I am sure you can accomplish it with some magic. Sounds like a "type" pattern. Similar to page types or post types.
I know what he wants to do, I was thinking of this same awhile ago. I think your grid ft will cover what he wants to do.
Basically, if I select this field, display this, this and this for them to fill.