@prettysunshinez (and @inventsekar ) You can hide columns with CSS - the data is still there for the drilldown to use.
<row>
<panel depends="$stayhidden$">
<html>
<style>
#twocolumns th:nth-child(2),
#twocolumns td:nth-child(2){
display: none;
}
</style>
</html>
</panel>
<panel>
<table id="twocolumns">
<search>
<query>| makeresults | eval _raw="Col_A,Col_B
a1,b1
a2,b2"
| multikv forceheader=1
| fields - _time _raw linecount</query>
<earliest>-15m</earliest>
<latest>now</latest>
</search>
<option name="drilldown">cell</option>
<drilldown>
<set token="selected_b">$row.Col_B$</set>
</drilldown>
</table>
</panel>
<panel>
<table>
<search>
<query>| makeresults | eval _raw="Col_B,Col_C
b1,c1
b2,c2"
| multikv forceheader=1
| where Col_B="$selected_b$"
| fields - _time _raw linecount</query>
<earliest>-15m</earliest>
<latest>now</latest>
</search>
<option name="drilldown">none</option>
</table>
</panel>
</row>
