I don’t believe Revit API can convert sheets to placeholders, but you could do the following:
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Collect the sheets you want to convert
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Get all parameters and values
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Delete the sheets
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Create placeholders
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Set all the values you got before
The only custom node you likely need is creation of placeholder sheets, of which you could use my node from Crumple.
This worked for me:
Sheets to placeholders_R26.dyn (33.5 KB)
