Selecting Circuit - Estimate Memory from the project editor's main menu opens the Estimate Memory dialog box and subsections your project. A simple status popup appears to indicate that the circuit is being subsectioned. When the subsectioning is complete, the memory use estimate and the subsectioning information, listed by level and total amounts, appears in the dialog box. You may select the output and copy it to your clipboard.
View Subsections: Clicking on this button opens a viewer which displays the subsectioning of your circuit. You may view all metalization levels and their subsectioning.
For a in depth discussion of subsectioning, see Subsectioning in the Sonnet User's Guide.
The subsection viewer is essentially a limited version of the current density viewer.