How to set / overwrite instance inherited netset property in layout view?

In general inherited connections in layout are a slightly different concept, because you always have physical connectivity - you want to connect up based on wires connected to pins. I don't believe adding a netSet on an instance will override the connectivity because presumably any nets within the instance would have a pin with a netExpr on (that you're attempting to override) but the instance would have instTerms which are connected to a specific net at this level. An instTerm connected to a net will always override whatever the netExpr said.

Not sure if that was very clear - it's hard to describe without an example. So maybe talking this through with customer support would make sense?

Regards,

Andrew.

 It should help thank you. I will try in that sense and share my findings.

By the way, I am reading your comments and answers since 2 to 3 years  and always found them relevant to a point I never got to send a question. So keep going I am sure many readers share my compliment.

-Sami

 As promessed for sharing the findings,

here is the solution I propose based on your hints.  It works at the cellview level.

I have not yet tried if we should map both "gnd" and "gnd!" terminals to enable inherited connection propagation down into the hierarchy,

thanks

-Sami

procedure(SLMapInstTerm(cv InstName TermName NetName)
let( (myInst myInstTerm myNet )

if( myInst=dbGetInstanceByName(cv InstName) then

; creating new net or getting it if existing
if( (myNet = dbFindNetByName(mycv NetName))  then
     else  
    myNet = dbCreateNet(mycv NetName)
    printf(" --I-- New Net %s created \n" myNet~>name)
)
; Mapping the terminal by name to the new net
foreach(myInstTerm myInst~>instTerms
        if(myInstTerm~>name == TermName then
            myInstTerm~>net = myNet    
            printf(" --I-- Connection remapped   %s :  term %s   -> %s\n" myInst~>name TermName  myNet~>name))
        )
else
    printf(" --W-- Instance Not found : %s \n" myInstName)
)
))
;===================

; quick test

mydb=hiGetCurrentWindow()
mycv=mydb~>cellView

SLMapInstTerm(mycv "I1" "gnd!" "GND1")
SLMapInstTerm(mycv "I2" "gnd!" "GND1")