Voting with conditional questions

[Nacho de la Vega]

We are trying to set up a vote with Helios that consists of questions in two stages. First the voter must choose a category and then a series of options depending on the first choice. If the voter chooses in the first question the category 'A', in the next step he can select any number of options from a group 'a', if the first choice was 'B', he should choose in the next question from among the options of another group 'b' and so on. The vote should therefore consist of a selection between 'A', 'B'... and a multiple choice corresponding to the appropriate group of options in the second question, 'a', 'b'... For example, votes with 'A' and options from 'b' would not be valid, and neither would votes with mixed options from 'a' and 'b'.

Does Helios support this type of voting? If not, would it be possible to modify the standard version to set up a voting as described?

Thank you very much,