MODEL CHANGE in Transient heat transfer analysis

[nikhiljk]

I have been trying to add/remove elements in transient heat transfer analysis using *MODEL CHANGE option but, whenever I import the *.inp to ABAQUS, its is only excepting the steps not the model change options. I am working on a laser additive process and am relatively new to ABAQUS. MY *.inp code is as follows:

**
*restart,write,FREQUENCY=1000,overlay
**
**speed = 0.00762 m/s
**
**
*step,inc=2000,amplitude=step
*heat transfer,deltmx=2000
0.1,1,1e-10
*MODEL CHANGE, REMOVE
newele,
**
**
**
**
*
*node file,frequency=2000
nt
*end step
**
**
**
*step,inc=2000,amplitude=step
*heat transfer,deltmx=2000
0.1,200,1e-10
*MODEL CHANGE, ADD
30001,
**
**
**
**
*boundary,op=new
botnod,11,11,303
**
*cflux,op=new
1,11,0
*node file,frequency=2000
nt
*end step
**
**
**
*step,inc=2000,amplitude=step
*heat transfer,deltmx=200
0.0001,3.281e-002,1e-6
*MODEL CHANGE, ADD
30002,
*boundary,op=new
botnod,11,11,303
*cflux,op=new
2,11,105.00
*output,field, frequency=3000
*node output
nt
*node file,frequency=2000
nt
*end step
**
Is there some problem in importing or have I made some mistake in the syntax. Plz help me wid the same.