Import .csv into Level Manager and line styles that begin with "0" are "Not Found"
Problem is actually with Excel. If .csv is opened in Excel, enter 0468 for style name. Tab out of that cell and 0 is dropped, changing name to 468, a style which does not exist. If .csv is opened using Notepad, change style to 0468, save file and import into level manager, styles are correct. Excel, by default, drops the 0. If style name is entered, prefixed with a single quote ('04 68) Excel will retain the correct style number and .csv will import correctly.