I was teasing you.
OK then; "Please add more information to help us understand",
The reason I say this is twofold.
1. You asked "How can the PIC send to 0v the outputs".
Note (based on years on this Forum): Many people say "PIC" when referring to "PICAXE".
To make a PIC "send" 0V to an output , for most Port.pIns, you have to set the TRISx register, switch off the ADC where appropriate, and then set the specific Potx.bit to zero.
To make a PICAXE "send" 0V to an output depends on WHICH PICAXE you use.
You may have to set the direction first, or not, depending on which PICAXE and then use a Low command.
These methods, in effect, ground the desired pin. i.e. "send 0v".
2. The "electronic device". There are dozens of different PICs , there are not so many PICAXEs. Some PICAXEs have fixed Output and Input pins. Unless you are experienced with Poking your choice may be limited and even then, I believe, the option to change is not universal. So, without the information we can't suggest a PICAXE equivalent.
Without telling us the desired I/O pins of this "electronic device" it is IMPOSSIBLE to say 100% whether you can directly swap out with a PICAXE.
It could be dead easy...
So, let me be precise;
1. What PIC is in this "electronic device". e.g. 16F88.
2. Which PIC pins are connected to these pullups that you wish to set Low?
3. And these particular pins; are they definitely pulled up by external components? Resistors? Logic?
4. Or are they pulled up by the internal PIC 'weak pullups'?
5. Or are the pins set High by the PIC?
If 'Yes' to either Q3 or Q4 then it implies that the pins might also be set to 'Input' more by the PIC's code. Sometimes referred to as tri-stating.
The solution may be dead easy, but without more information we are in guessing territory.
If someone just says "yeah, just stick in a such and such" and it went POP you'd be a little annoyed.