Code:
su = Study("SU", GetChartID() );
re = Study("RE", GetChartID() );
PlotOHLC( re, re, su, su, "",colorDarkGrey,styleNoRescale|styleNoLabel|styleCloud,0,0,5);
Right click on the lines one by one and change the Study ID from properties to SU and RE
btw, the code is from Amibroker help, I have not written it
Happy