Try setting the trend up while connected to the DoMore Simulator?
This may be the best workaround.
The primary issue is that Trend View currently does not understand NOT being connected to the PLC. Basically, a lot of code assumes there is an online connection. A lot of code would need to become "mode" based (online vs. offline), which it was never designed for. It probably is do-able, but not "high priority" feature.
I hope that @Watermark_JS idea is a good enough work around.
BTW, you can take an existing OFFLINE BRX project, then run it in the Simulator (it can't simulate everything, but you can at least get online).
Yeah, that worked. I took an OFFLINE BRX project with a bunch of AXIS instructions, then hit the Simulator button in the Online toolbar (this writes the BRX disk project to the Simulator). I was able to create a Trend View from an AXCONFIG instruction (even though AXIS is not supported in the Sim, the Sim can handle the memory, just not the actual high speed I/O functionality).
From there, I created a .TRN Trend Layout of $Axis1 stuff in that Trend View. I then shut down Designer, then connected to a BRX PLC and was able to open the .TRN Trend Layout file - and it started monitoring!
I think that's a good 80% solution?