This is not recommended because it takes at least twice the time/download.
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Then - after configuring Lion - you can to upgrade to El Capitan. If you already attached the SSD you can use Internet Recovery Mode (hold cmd R or alt cmd R while booting) to first partition the new internal drive and then restore the original system (10.7 Lion).
#HOW TO CREATE A RECOVERY PARTITION MAC OS X EL CAPITAN INSTALL#
Quit Disk Utility and install El Capitan.
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Click the + plus button to create a new disk partition on this volume, give it an obvious name like El. Open Disk Utility and select the hard drive you wish to partition from the left side menu (often called Macintosh HD. If your HDD is still mounted you can download El Capitan from the Apple App Store and create a USB installer thumb drive: Creating a New Partition & Installing OS X El Capitan to Dual Boot the Mac.