I've been racking my brain for weeks on how EPMA loads multiline formulas but there doesn't appear to be a way to do it manually. Finally I have a breakthrough.
First I have replaced all the newline characters in my formulas with \n. For a test I created a small csv file with a single line.
"Measure","Keith","CASE WHEN Is([Scenario].[Actuals], [Scenario].CurrentMember) THEN\n[Net Income]\nEND"
Next I created a simple parent/child dimension building load rule. With a small twist. On column 3 I created a replacement indicating that "\n" should be replaced with "!".
Once the load rule is saved. I copied the rule back to my desktop using the "Save as" functionality.
Once the file existed on my computer, I opened the file in notepad++ and looked for the !. Once I found the ! I highlighted it and hit enter to replace it with a carrige return and newline.
Next I used the open in EAS to load the modified rules file back into Essbase.
Once again I used the save as capability in EAS to save the rule back to the target application.
Obviously this has no effect on the performance of Essbase but it sure is nice to see our rules in a little more readable format.