how get constructors?

imagine bottom category constructors practical method

public category foo
{
   ...
   open foo() {...}
   open foo(int i) {...}
   ...
   open practical vacant somethingelse() {...}
   ...
}

and i wish emanate heir category overrides practical method:

public category bar : foo 
{
   open overrule vacant somethingelse() {...}
}

and another heir does some-more stuff:

public category bah : bar
{
   open vacant domorestuff() {...}
}

do i unequivocally have duplicate constructors foo bar bah? following i change constructor signature foo, i have transform bar bah?

is there proceed get constructors? there proceed inspire formula reuse?

code1