Is it possible to Slice DSP block in Zynq FPGA?
Your question is not clear to me.
For e.g. in a Zynq based 7 series Xilinx FPGA, the DSP48E1 Slice (containing many basic elements such as adder, mult, etc.) is one basic DSP unit. In you design you can instantiate the DSP48E1 Slice.