Issue
You want to group instruments along a truss or pipe with that truss.
Solution
There are 2 methods for defining a multilight object and a group of light objects attached of it.
Method #1
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Create or insert a block (ex: a truss).
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Select Define new LD object from Lighting>Utilities menu or type _LDWNL in command line.
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In Append Object Specific Data page select the block you've want to define MultiLight object, select Multiple Light type from combo box and click on Add Attributes button.
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In Update Block References from Current Drawing page select Block References button.
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Erase block reference from drawing and insert it with insert command.
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Select Attach data to Light from Lighting>Attach Data menu or type _LDADL in command line. Select new insert object.
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Specify all data you've want.
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Select MLT Group button.
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Select light fixtures to define multi light group.
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Select OK button.
Method #2
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The easiest mode to create a multi light object is Define MultiLight command. Select it from Lighting>Utilities menu or type _LDUML in command line.
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If you have create before a block that you want to use as multilight object select it.
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If you don't have a block that can be use as multi light object in your drawing, type N to create it.
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Pick insertion point of the new block.
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Select entities to define the new block. Right click or enter after selecting all.
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Select light instruments to define multi light group. Right click or enter when you finish the selecting.