Yup I need to melt together two xrns 
open two instances of Renoise.
yea it simplify the thing, I never thought about opening two instances. thanks !
I may put my hands into lua scripting and write a import tracks tool a day.
It took me times to change samples numbers, copy patterns, copy samples, copy dsp chains but it works. It can be easier (like import xrns track, select track, import related samples, change samples slot, import or not dsp chain) but I don’t know if it’s possible to do it with lua.