Normally you can select multiple transactions in any account by selecting the top transaction followed by pointing at the bottom one and selecting while holding down the shift key. In Q 2015 Deluxe, this works on bank accounts, but doesn't seem to work on investment accounts. Since right-clicking on an investment transaction shows several options (void, cut, copy, paste, etc.) to be performed on "investment(s)", the intent of the programmer was to allow you to select several transaction and copy or cut them.
How can I select multiple investment transactions?