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linear pattern not working on sheetmetal parts?

I need to copy a certain feature a bunch of times in a sheet metal part (and preferably even to other sheet metal parts , in same part studio) . 
but I need to finish the part before anty type of pattern/ paste of features will work? problem is: features added after finishing sheet metal part are not showing up in the flat pattern...
some examples in this particular example: several tabs to connect 2 sheetmetal parts, (see picture)  to be placed at specific locations and merged with existing geometry. 
it's very tedious and error -prone to design (and later maybe update) evey instance by hand... rather use 1 master feature to copy and keep associativity to this one "master". (one can imagine making a library of regularyuse sheet metal features to re-use throughout)  I tried a whole lot of different approaches: tried designing it in a separate part studio as 2 seperate part, one body  to subtract and one body to add.  and then deriving it into the sheet metal part studio, adding it to the parts with booleans. again no luck with sheet metal, only with "finished" sheet metal or solid parts.  
what would be the way to go about  copying certain features at specific places in a part studio? 

other example is a  venting louver to the side of the part that uses the same sheet metal feature and that is then only a simple rectangular or circular pattern.



Answers

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