See this page in the manual for details on how to make .dwp (monolithic format) files for DirectWave. You can use DirectWave for PC, the Channel Sampling Robot or FPC to make presets.
THE EASY WAY TO USE FL STUDIO TO TRANSFER INSTRUMENTS TO YOUR MOBILE DEVICE
Put the correct format files in the appropriate FL Mobile folders as follows:
Put all your custom instruments and samples in the FL Studio Mobile FL Plugin folders on your PC, then use the SHARE function to send them to your Mobile device as follows:
You may also find suitable DirectWave patches in the DirectWave Patch & Preset Sharing forum. Remember that this is the forum used by the PC DirectWave users, so be sure to understand the difference between Monolithic and Standard presets.