I prefer to keep the displacement functions (especially with the customer's products), sometimes the original origin can be interesting to replace another part (typical case of sets where all the parts are modeled with the same origin).
The goal for the moment was to recover the shape of a part if possible in the right direction (which was not the case) and to create a shaped tool (milling cutter). Everything was already done, but with the tool upside down, you have to turn everything constantly and be very attentive in the mirrors of the import of the outline so as not to make a mistake, hence my request.
The advantage of this method is to have a compliant and error-free tool. In addition, you can come and check with the stress assembly of the part and the tool if everything agrees because you always make some changes to the cutter. Before, I worked it in the same way but under another 2D software with DXF import, etc...
Anyway, I thank you all for your answers, it's great and it's kept me moving forward.