I have searched and found that, using API, it is not possible to get the path of the template used for the BOM table inserted on a drawing.
Is this correct or am I missing something.
HELLO,
if, it is necessary to insert a column in the BOM then you click at the top on the letter of this column then you select ∑ and you put this formula in the box after the = SW-Name of the folder (Folder Name) then you save your BOM
Where is mention of template path in your reply? Why unnecessarily divert the issue?
Where is the mention of the model path in your answer? Why deflect the question unnecessarily? 
She is there = SW-Name of the folder (Folder Name)!
And I am not unnecessarily diverting the question! I at least take the time to answer!
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Folder name? I am asking about ‹ the path of the template used ›. Please read the question carefully. This is my last response to you. Thank you.
It seems to me that the template to use is in a folder? so it may not be the whole solution but at least a part!
Perhaps this:
https://help.solidworks.com/2020/English/api/sldworksapi/SolidWorks.Interop.sldworks~SolidWorks.Interop.sldworks.IView~GetKeepLinkedToBOMName.html
General link to Get bom Table:
https://help.solidworks.com/2020/English/api/sldworksapi/SOLIDWORKS.Interop.sldworks~SOLIDWORKS.Interop.sldworks.IView~GetBomTable.html