For example if your parent dashboard and target dashboard both have a time picker and a dropdown, then they will both have these elements:
<input type="time" token="time_tok">
...
<input type="dropdown" token="foo">
...
In the drilldown action of the parent element, you'll need to pass the token values to the target in the url. If it's a table or some visualization like that, it might look like this:
<drilldown>
<link target="_blank">/app/<your_app>/<target_dashboard>?form.foo=$foo$&form.time_tok.earliest=$time_tok.earliest$&form.time_tok.latest=$time_tok.latest$</link>
</drilldown>
If the token names are different on the target dashboard, you'll need to change the names accordingly. If you want the drilldown to actually come from a link and not a table, you'll have to change the link target to update on token changes. This could be done like this:
<panel>
<html>
<a href="<url>/target_dashboard?form.foo=$foo$&form.time_tok.earliest=$time_tok.earliest$&form.time_tok.latest=$time_tok.latest$">Link to target dashboard with filters based on this pages settings</a>
<html>
<panel>
You should refer to these docs for more detail. You are most interested in <link> and <drilldown>.
