indent-under

Indent to the next text on the previous line.

Ctrl-Alt-i

This function starts at the current column on the previous non-blank line, and moves right until it reaches the next column where a run of non-space characters starts. It then replaces the indentation at point with indentation that reaches to the same column, by inserting tabs and spaces. With a highlighted region, it indents all lines in the region to that same column, scanning the last non-blank line before the region.

With a numeric prefix argument, indent-under goes to a different run of non-spaces. For instance, with an argument of 3, it goes to the previous line and finds the third word after the original column, then aligns the original line there.

If the previous non-blank line doesn't have the requested number of words, it runs indent-to-tab-stop.

More info:

Indenting Commands

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