Change path name in qsf to sdc

There are no .qsf timing settings used by TimeQuest. That setting is for the Classic Timing Analyzer.

My guess is you're using "derive_pll_clocks" which names the PLL outputs with the long hierarchical pin name. Note that you can go to TimeQuest's Info messages at the bottom, and where this assignment is called out, it shows the individual "create_generated_clock" assignments for each PLL output. You can cut and paste these into your .sdc and change the -name option to something more readable. The only major downside with this is that if you change your PLL, you need to manually change these assignments to match them.

Personally, I've seen that mistake happen to often and just accept the longer PLL names. (I think Altera plans on having a better workaround for long PLL names someday, but it's something that should have been done years ago...)