Subitems: templates, multiple groups, multiple subitem columns

We need templates in subitems. Automatically display predefined pulses in subitems.

There should be multiple groups within subitems.

I would like to see multiple subitem columns (not to be confused with adding another column in subitems. For example, we use a board to track all the events our company attends. Each event (pulse) has multiple tasks associated, this is where we use the subitem. We need to store more relevant information about the event. We want a separate subitem column with all the financial information which rolls up to the main pulse. This info should not be viewed with the other subitems because the subitem column types are completely different.