Attached is a basic Grasshopper script to create constant and variable distance tabs for unrolled 4-sided panels. You can customize based on number of edges, etc.
I get this request often because variable tabs was part of the old PanelingTools command prPlanarLips. The new ptTabs command removed this functionality, and the reason is because it was hard to use for multiple panels (hard to determine which edges get what distance).
VariableTabs.gh (25.4 KB)