ComboChart - multi dimention accumulation

[#1]

Hai...

I'am Mahmud from Indonesia, but now i working for Japan company.

I have task to make visualization, but unformtunatelly when i try, i have a problem (because poor knowledge),

I can't  visualize line accumulation chart, event with simple data likes below example

Date     Dealer Name     SalesQty

1 jan 2015; Delaler01; 100

1 Jan 2015; Dealer02; 110

1 jan 2015; Dealer03; 89

2 jan 2015; Dealer01; 110

2 jan 2015; Dealer02; 115

2 jan 2015; Dealer03; 114

my expectation is line chart should be looks like liniear (not zigzag)

I'm very appreciate for someone to help me,

Thank you