void splitBlock(MemoryBlock block, Address newStart, String newBlockName) {

		SplitBlockCmd cmd = new SplitBlockCmd(block, newStart, newBlockName);
		if (!tool.execute(cmd, program)) {
			Msg.showError(getClass(), plugin.getMemoryMapProvider().getComponent(),
				"Split Block Failed", cmd.getStatusMsg());
		}
	}
Split the block by creating the new block at newStart address.
@param block block to split
@param newStart start address of new block
@param newBlockName new block name
@return boolean true if the split was successful.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/memory/MemoryMapManager.java