Qsys Avalon Streaming Sink in Component Editor

Those eight 8-bit symbols the tools are showing are all part of the same streaming interface. The tool is showing you that the symbol size is 8-bits and the total data width is 64-bit (i.e. 8 symbols wide). To implement something similar your streaming data would need to be 64-bit bit wide, with a symbol size of 8 bits, and a total width of 8 symbols. So you would define your RTL with a 64-bit data port and in component editor you set the symbol size to be 8, and if I remember correctly the tool will figure out the port is 8 symbols wide automatically.