If you travel to CA for 30 days for business, you are still a Non-Resident of California and those days would not be considered as as CA source income.
Nonresident
A nonresident is a person who is not a resident of California.
Generally, nonresidents are:
- Simply passing through
- Here for a brief rest or vacation
- Here for a short period of time to complete:
- A job
- A transaction
- Contract work
If you received a new stock grant from a CA company, when you sell the stock, it would be considered CA source income.
Here's more info from FTB Pub. 1100 and How to File a Non-Resident State Return.
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