I would like to do the following but not sure how to implement that in pd:

An audio file is playing in loop and every time the file is strat from the beginning (or upon some trigger) some random values/samples will written on top of the exiting file. The idea is that it will transform the original audio file to somewhat noisy/clicky audio file over time

how can this be done in pd?

Thanks

load it into a table that you play with [tabplay~] and alter the values as you play it (you can use [tabwrite~] later in the signal chain)
edit: or just set values in the sound file with regalar [tabwrite] directly

What do you man to usr [tabwrite~] in the signal chain? when I write random values into [tabwrite~] that have the same name of the [tabplay~] (with the original audio file) it overwrite it. How can it just add random values in some samples of the buffer ?

Isn't overwriting it what you want?
Here are a couple examples:
make_into_noise.pd in this one a set number of random samples every block get set to random values, until there are none left. (every loop through the sound file sets N more). There is an array for per-block 'urn's that keeps track of which indices have already been written to.
make_into_noise_2.pd in this one it uses noise~ both to choose to insert a new random number, and to generate one. A separate array keeps track of which indices have been written to. Lots of expr~. This one also has the option of slowly adding more noise