No.  RAID Level Migration/Online Capacity Expansion cannot reconfigure TO or FROM a nested RAID level (10/50/60).  You'll need to backup/restore or create a separate RAID array.
My current configuration is:  Dell PowerEdge R510 with PERC H700 RAID controller. I have 2 x 300Gb 15k disks and 6 x 600Gb 15k disks. The 2 x 300Gb disks are on RAID1 for the OS The 6 x 600Gb disks are on RAID10 for the DATA Is it possible to add 4 x 600GB 15k disks to the RAID10 without restarting or any dataloss?  
Is it possible to add disks to RAID10 using OSMA