How to get two Trendlines to start and stop at two different intervals on a chart

[ibddude]

All;

I researched and trialed different options on this for awhile, I am not a charting expert but what I'm trying to do is chart two separate trendlines for two separate time intervals but only show (and have the trendline effected by the data of that interval. Below is the data and where I at least have the first trendline correctly shown but the second one which is later in time (x-Axis) projects the trendline back to 0. Any ideas on how I get the second trenline to start at 2017-Q1 would be very appreciated! P.S. The $118K is an anomaly so while I want to show it on the X axis for the time interval, I don't want to include it into the Model A trendline.

Thanks
Mike

Year 2013-Q1 2013-Q2 2013-Q3 2013-Q4 2014-Q1 2014-Q2 2014-Q3 2014-Q4 2015-Q1 2015-Q2 2015-Q3 2015-Q4 2016-Q1 2016-Q2 2016-Q3 2016-Q4 2017-Q1 2017-Q2 2017-Q3 2017-Q4 2018-Q1 2018-Q2 2018-Q3 2018-Q4 2019-Q1 2019-Q2 2019-Q3 <colgroup><col></colgroup><tbody> </tbody>

Quarterly Billing $118,447 $409,385 $422,761 $440,817 $488,149 $557,512 $558,138 $664,555 $752,812 $761,219 $600,405 $732,650 $751,872 $838,705 $806,192 $820,687 $614,904 $712,844 $708,267 $697,713 $665,093 $617,945 $616,063 $696,549 $678,059 $614,899 $627,303 <colgroup><col></colgroup><tbody> </tbody>

Model A 409,385 422,761 440,817 488,149 557,512 558,138 664,555 752,812 761,219 600,405 732,650 751,872 838,705 806,192 820,687 <colgroup><col></colgroup><tbody> </tbody>

Model B 614,904 712,844 708,267 697,713 665,093 617,945 616,063 696,549 678,059 614,899 627,303 <colgroup><col></colgroup><tbody> </tbody>

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[pbornemeier]

Option 1
Put =NA() formula in the 2013-Q1 through 2016-Q4 cells for Model B (D2:D17)

Option 2
Perhaps the second trendline could be simulated by calculating its origin and slope then plotting that line on the graph. The line could be redrawn by event trigger whenever a new point was added.