Duplicate half of widescreen monitor to third monitor

Hello -  I have a Dell P3418HW monitor installed and connected to a PC.  I'm using Dell's Display Manager to split the monitor so it acts as two monitors.  That works fine.  The issue is that this user had previously 3 monitors and had monitor 1 mirrored to monitor 3 so that a customer could see what was on that screen.   Monitor 2 was an extended desktop of monitor 1.   With the Dell P3418HW I cannot find a way to duplicate half of the screen (equivalent of one monitor in the previous setup) to the other monitor.  Dell says their software can't do it.  

Anyone run into this or anything similar and have a solutions or suggestions?   Please and thank you!
thecomputerplaceAsked:
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Davis McCarnOwnerCommented:
The number of monitors supported is a function of the video card and the PC you are using, not a function of any given monitor.  What is the make and model of both the PC and the video card?
What O/S is running, too?
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thecomputerplaceAuthor Commented:
I found that Ultramon wIll do this.    It lets you Select a specific application or a part of one screen to mirror to another.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
An alternative would be to have a DisplayLink based USB3 monitor plugged in and mirroring one of the Dell based split screens. We have this setup both internally and in client locations for both desktops and laptops. Many of our clients are accounting firms so they like the ability to mirror their screen while going over their data together.
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thecomputerplaceAuthor Commented:
I found software that will What I need
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