To get multiline fields from RecoStar Design Studio into Ephesoft, you first need to combine it into a single line.
To do this you just need to create a Regular Expression Formatter Field.
In this field, just add the input, which will go along the lines of %IcrField1% %IcrField2%
Set a default pattern if you just want to copy the data across and then set the output the same as the input. This will turn your multiline address into a single line address that can be passed to Ephesoft.