Thanks for your answer, my deadtime function only works for digital signals since it searches for rising and falling edges.
The problem was due to an update of Qspice I think because as seen in the screenshot the symbol editors properties had disappeared, but now it is working again.
To help some people here is what I have done for the subcircuit :
.subckt deadtimeC IN OUT
Ø1 «IN´b» «OUT´b» «» deatimegeneratorc float TDELAY_RE=RisingEdge_delay float TDELAY_FE=FallingEdge_delay VHIGH=Vlogic REF=Vlogic/2
.ends deadtimeC
Don’t forget to mention the definition of the variables TDELAY_RE and TDELAY_FE on the symbol editor, as I have learned thanks to this forum.
The Vlogic don’t need to be defined since it is a device parameter not a variable.
I think that to wrap a code block into symbol we just need to copy and paste the code onto the symbol editor.