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Hi Mingyu,
I hope I understand your question correctly. There are two different category branch types available to you, for constructing a top-down activity analysis in LEAP. I'll introduce both, using the example you provided in your post.
The yellow folder, or 'Category', allows you to add additional categories or technologies underneath, each with their own separate activity level and energy intensity.
To use your example, this would look like:
> Industry (yellow category, with activity level = value added)
>> Raw coal (technology with final energy intensity, with appropriate activity level and energy intensity per unit of activity)
>> Coke (same as above)
>> Crude oil (...)
>> Gasoline (...)
>> ...
The green folder, or 'Category with Energy Intensity', allows you to specify the total energy intensity for the whole category, while individual fuels or technologies are assigned a percentage share of this total. For example:
> Industry (green category, with activity level = value added, and final energy intensity = total industrial energy / value added)
>> Raw coal (technology, with appropriate fuel share of the energy specified at the category level)
>> Coke (same as above)
>> Crude oil (...)
>> Gasoline (...)
>> ...
Note that the category with energy intensity allows you to very easily implement an efficiency target, by reducing the energy intensity at the top branch. To implement a similar target using a yellow category to represent the industry sector, you would need to modify the final energy intensity of each technology or fuel which is found inside the category.
Have a look here for some additional information on demand branch types:
http://www.energycommunity.org/WebHelpPro/Demand/Demand_Properties_Wizard.htm
Hope this helps,
Taylor