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OK. Solved the problem. Found a topic on the Autodesk Forums where it was solved by @steven-g. It needed to be turned into a dynamic block, Once inserted and the visibility parameter is toggled and it updates on regen. EXAMPLE(1).dwg

I am happy to be told incorrect but I think the only way is to insert the block add d1 d2 d3 then put d4 as a field made up of "this blocks attribute values" not the block definition it was changing values just did something wrong in the + two fields. But did see 250+410 d1+d2 etc as answer. Lots of google answers, I copied the block can see the changes after RE. Need to look at field values comparing ID. If I could find this maybe