Thanks, for your time and interest, nepalean, truelynepali. I believe there are people here in sajha willing to help and share. In fact, my problem here is I need to attach the angles around the inner surface of the cylinder ( created using loafted/sheetmetal/SolidEdge). As shown in fig. The holes were patterned as features around curve. I need to associate the angles with holes. The angles are supposed to be fatened to the holes using bolts. I shall get back on AUTOCAD after I resolve this pattern problem.