The Streamable Grid is covered extensively in the dedicated Streamable Grids Chapter. Please take a look there if you have any questions about this asset!
You can create this asset by selecting from the Top Menu Bar:
Assets -> Create -> Deep Space Labs -> SAM -> Streamable Grid
or by right clicking a folder (or inside a folder) within the Project Hierarchy and selecting from the pop up menu:
Create -> Deep Space Labs -> SAM -> Streamable Grid
By default this Asset is given the name StreamableGrid, however we recommend changing this name to something that will better help you differentiate it with other Streamable Grid Assets in the future.