Custimize the X and Y shifting on subplot mode

Hi Dear experts, I am new using GMT 6
Suppose that I am using the subplot mode with the following commands:

gmt subplot begin 2x1
gmt coast … -c0,0 #Plot 1
gmt coast … -c1,0 #Plot 2
gmt subplot end

My question:
How to set the -X -Y shifting option in this context in such a way that I could shift the plot 1 or the plot 2 internally? I was trying to place it on the gmt coast line but it did not help

Could someone help me?
Thanks in advance!

Think you need to look at -C for each panel