This chapter explores various approaches for slicing and toolpath generation for DED processes. It introduces the STEP-file format-based planar and non-planar slicing methods, including pseudocode and implementation results. The chapter also covers multi-directional slicing, NURBS-based freeform slicing, and segmentation techniques for thin-wall components. Each method has been discussed in detail, highlighting its advantages along with practical implementations. The chapter concludes with a discussion on the development of a comprehensive process planning platform.