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The induvial factories will be removed from the sector and property lists and replaced with a single complex hub item.
2 Expanding a Complex
You dont need to build the full complex in one go, you can always expand it later. To expand an existing complex, you need to Complex Extension Kits, one for each factory you wish to add.
NOTE: you dont need additional Complex Construction Kits, you only need the 1 to create the initial complex.
Load a TL with Complex Extension Kits, then you can deploy them, similar to create the complex, you will get to choose which stations to link. First you select the existing complex you wish to expand, then select the factories you wish to connect to it. The number of factories you can connect is limited by the number of Extension kits you have available.