How to get value of a field to show in another field?

Hello All,

I'm a newbie with MIGX. I'm trying to create a column chart TV for my client. The process allow client to insert content of chart by themselves e.g. title, columns, series, values. The process allow client to create multi-series column chart too.

However I'm getting in problem with getting columns list to show in 'series' field which client should add series title of chart and values by referring to column. Please see example below

1. Add columns: Column1, Column2, Column3, Column4
2. Add series: SeriesA
   
   
   
   • Column1 -> Add Value: 10%
   • Column4 -> Add Value: 11%
   • Column5 -> Add Value: 9%
   • Column6 -> Add Value: 6%
3. Add series: SeriesB
   
   
   
   • Column1 -> Add Value: 3%
   • Column4 -> Add Value: 15%
   • Column5 -> Add Value: 2%
   • Column6 -> Add Value: 14%

I don't know how to get columns list from Add columns step to show in Add series step.

Please help.

Thank you