Convert Navisworks file to STEP. file?
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Step 1:

EXPORT FBX. FILE WITH NAVISWORKS
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Step 2:

WITH FBX. OPTIONS, YOU CAN ADJUST (OR JUST LEAVE IT) QUALITY OF EXPORTED FBX. FILE.
BETTER QUALITY>>>MORE MEMORY
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Step 3:

IMPORT (OPEN) FBX. FILE TO FUSION 360
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Step 4:

CLICK ON "OPEN FROM MY COMPUTER"
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Step 5:

SELECT TYPE OF FILE (FBX.)
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Step 6:

WAIT SOME TIME FOR IMPORT PROCEDURE, LATER CLICK "OPEN"
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Step 7:

IN FUSION 360, SELECT MESH TO BREP (MODIFY TAB)
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Step 8:

DEPENDS ON YOUR HARDWARE, SELECT MESH BODIES, YOU CAN SELECT ALL OF THEM IF YOUR HARDWARE CAN HANDLE.
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Step 9:

AFTER CONVERT PROCEDURE, MESH BODIES WILL REMAIN HIDDEN
***YOU CAN USE FUSION 360 FOR REDESIGN OF CONVERTED BODIES, OR USE ANOTHER SOFTWARE***
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Step 10:

UNDER FILE TAB, CLICK ON EXPORT
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Step 11:

SCROLL DOWN TYPE OF FILES, AND SELECT STEP. FILE (YOU HAVE ALSO OTHER OPTIONS)
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Step 12:

IF YOU WANT USE ANOTHER SOFTWARE FOR REDESIGN, JUST EASILY IMPORT STEP. FILE.