Yes and no; the choice is yours. During installation of BootIt BM, you will be asked if you want to enable support for more than four primary partitions. If you answer No then, if you like, you can continue to use other disk partitioning utilities. If you respond Yes, on the other hand, you must only use the partition tools in BootIt BM thereafter (because no other partitioning software supports the same powerful functionality that BootIt BM offers).
This option can be changed at any time via the Limit Primaries setting in BootIt BM. If that option is enabled for a drive, you can safely use other partitioning utilities on that drive.