Each plant that you design can have different insulation specification needs. You can create and edit plant insulation specification files with SmartPlant P&ID Insulation Specification Manager. Insulation specification files end with the extension .isl.
The New Command 
command prompts you to save the current file and then creates a new specification
file. You can save insulation specification files with the other reference data, or
wherever you want, by using the Save As Command. The insulation file associated with a plant is defined in SmartPlant P&ID Options Manager in the reference data settings. You can switch between plants and
specifications files by using the Open Database Command 
.
You can also edit some of the properties that are associated with an entire specification file by using the Options Command.