I design to grids and use symbols and/or groups to keep the columns together. Each column is a rectangle, and I can resize the height of the group to make them longer as required.
It’s really convenient as I can easily do things like treat the symbol as markup to hide it, or quickly move all columns forward/backwards over a browser window at the back of my mockup
One issue with this approach is that whilst grouped, I can’t snap elements to the edges of the columns - only to the outer edges of the whole symbol/group. I have to just approximate the widths of my elements unless I ungroup the columns, which is a pain.
As such, can I request the option to snap to objects that sit within a group?