If your field is [Period], then you could create a field [Period Group] that includes the two periods you want to see for each period group. Select the period group. Use period as the chart dimension.
[Period Groups]: LOAD [Period Group] ,subfield([Periods],',') as [Period] INLINE [ Period Group:Periods YTD:YTD,LYTD MTD:MTD,LMTD WTD:WTD,LWTD PTD:PTD,LPTD ] (delimiter is ':');