LTspice, how to model a TLine
I'm not sure you can call a model TLINE but maybe you can.
You should not enter units. Let's call the model 'myTline':
.model myTline LTRA(R=10m L=9n C=3.59p len=1)
R/L/C are parameters for a piece of wire of '1' length (if R/L/C values describe Ohms/Henries/Farads per meter then len of 1 is 1 meter).
So if you want double the length you set it to 2 etc.

Then you just fill the 'Value' in LTRA component properties to be 'myTline', don't fill the other fields.