I presume you're modeling in CAESAR II? If so then:
Assume you have this:
10-----------20--------------30
elmt 1 = 10' elmt 2 = 10'
To remove node 20:
1) Change node 20 to 30
2) Change the length of elmt 1 to 20'
3) Delete element 20-30
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Regards,
Richard Ay - Consultant