Open the Imperfections folder in the navigator. To create a new imperfection case, double-click Imperfection Cases.
In the 'New Imperfection Case' dialog box, enter -Y-direction as 'Imperfection Case Name'.
The 'Local Imperfections Only' type is preset, as well as the 'Assign to all COs without assigned Imperfection Case' option. Both are appropriate, so click OK.