Thank you for your replying!
Yup. FC layer modifying is available.
actually, I just want to reduce the FC layers of original Resnet and Vgg network with its dimensions.
Then, If I download the pre-trained network with original structure and load that model with weight parameters on the code and change the FC layer structure, then every weight parameters in the convolutional layers are still alive?
If weight parameters in CNN layer are still alive after changing the dimension of FC layers, then how can I change or reduce the dimension or the number of FC layers?