Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 149)

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 Save an ad hoc trend display as an independent display by clicking it
and using the Save As command with a .pdi filename extension.
 If you had a display entry from a ProcessBook open when the instant
trend was created, the instant trend can be saved as a subordinate of
the display by using the Save command.
 You may save an ad hoc trend as another file type, such as a bitmap
(.bmp) file, using Save As.
You cannot save an ad hoc trend from view-only mode.
OpenVMS Trends and Graphics
FactoryTalk Historian ProcessBook allows you to convert your existing
OpenVMS trend and graphic files for use within a ProcessBook.
Specifically, the following types of files are supported:
 PIDisDIFF files
Contain trend graphs built using the FactoryTalk Historian data
Trending Package. You can convert horizontal, vertical, composite,
and overview trends.
 PI-GP files
Graphic files built using the PI-GP Graphics Builder.
Before you can convert your trend files (PIDisDIFF), you must convert
them as ASCII text files on the VAX and then download them to your PC.
Once the files are on the PC, you can import them to a ProcessBook.
Trends are formatted based on the settings on the Trend Elements tab in
the ProcessBook Preference dialog box.