syntax for copying fields using variable

[tob at b-e-s-t.com]

Using fp 5.0.13R4 on Centos 5.4
I wanted to use the syntax below to copy a number of fields from one record to another but get a syntax error.
Is this possible?
Thanks
 
After opening the two records without any issue
lookup ipd = invprod@ r=free -e 
lookup form = f837@ k=kk i=a -nx
 
I wanted to copy fields 80-120 and 201-400 using a variable loop
 
ct(3,.0)="79"
 
nxct1 ? If: ?
 Then: ct=ct+"1" ?
1564 ------- - - - - - - - - - - - - - - - -
 ? If: ct lt "120" ?
 Then: ipd(ct)=form(ct);goto nxct1 ?
1565 ------- - - - - - - - - - - - - - - - -
 ? If: ?
 Then: ct="201" ?
1566 ------- - - - - - - - - - - - - - - - -
nxct2 ? If: ?
 Then: ct=ct+"1" ?
1567 ------- - - - - - - - - - - - - - - - -
 ? If: ct lt "401"
 Then: ipd(ct)=form(ct);goto nxct2
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