How do you plan to solve it?
using vector slicing conecpt
module vector_splitter ( input [7:0] in_vec, output [3:0] out1, output [1:0] out2, output out3, output out4 ); assign out1=in_vec[7:4]; assign out2=in_vec[3:2]; assign out3=in_vec[1]; assign out4=in_vec[0]; endmodule