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Combining two or more models in ETABS

1) You can open two ETABS sessions say Model A and Model B.

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                                              Model A

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Model B

2) Select entire model say in Model A, use Edit > Copy option or Cntrl-C

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3) Now go to Model B and the use Edit > Paste Option or Ctrl-V to merge Model B into Model A.

4) Set coordinates and rotation for pasted model, you can see a preview of the model if you place the cursor over OK
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5) Click Ok and the

...

two models will be merged

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6) Additional models can be added by repeating this process

Note: The procedure above assumes that section properties used in Model B are also present in Model A, and you may need to reassign loading.