Cfrgtkky

The below code produces

I'm wondering if it's possible to have the subsections show up as i, ii, etc, on the subsection title (because it's clear which section they're in when they show up), but as 1.i, 1.ii, etc. when I refer to them. (So that the reader can distinguish between 1.i and 2.i, for instance.)

Possibilities:

1. Just enter the section number manually when I refer to it. This is
   worst, since it isn't robust to renumbering the sections.


2. Find a way to store the section number of Fruit Section, and use
   that when I make the reference. This is OK, but not robust to
   changing which section Apples is a part of.


3. Inside Apples, get the current section somehow, store it, and then
   refer to it. This would be robust, but would have to be done every time I want to make such a reference.


4. Better once-and-for-all solution to this problem.

.

documentclass{article}

usepackage{hyperref}

renewcommandthesubsection{roman{subsection}}

begin{document}

section{Fruit Section}

subsection{Apples} label{Apples-subsec} 

subsection{Bananas} label{Bananas-subsec}

section{Vegetable Section}

subsection{Kale}

section{Conclusion}

 As we recall from sections ref{Apples-subsec} and ref{Bananas-subsec}, apples and bananas are healthy to eat.

end{document}

You can use p@<counter> to add something before the actual counter value in references. To quote source2e (§22.1)

p@foo Macro that expands to a printed ‘reference prefix’ of counter foo. Any ref to a value created by counter foo will produce the expansion of p@foothefoo when the label command is executed.

So

makeatletter

renewcommand*{p@subsection}{thesection.}

makeatother

would add the section and a dot whenever you reference a subsection.

documentclass{article}

usepackage{hyperref}

renewcommandthesubsection{roman{subsection}}

makeatletter

renewcommand*{p@subsection}{thesection.}

makeatother

begin{document}

section{Fruit Section}

subsection{Apples} label{Apples-subsec} 

subsection{Bananas} label{Bananas-subsec}

section{Vegetable Section}

subsection{Kale}

section{Conclusion}

 As we recall from sections ref{Apples-subsec} and ref{Bananas-subsec}, apples and bananas are healthy to eat.

end{document}

Having seen the result I would probably not do this, especially if the subsections can be longer, and would include the section number for subsections also in the headings.