Power Automate Flow for List Update

I need a simple Power Automate flow designed to update a SharePoint list. This flow should specifically handle updating existing items..

Scenario: 2 lists.

List A: Title and Stock
List B: Title, Type (Add/Remove), Quantity

First step will be user adds list of items in list A with stocks (no flow so far)

Logic: when a user adds a record in list B, flow will check if type is Add, modify the Stock value for the respective title

Example, Item 1 has 1000 stock in list A, add a new item in list B, type Add, Quantity is 100, in this case modify the stock to be 1100

Now, add a new item in list B, type as Remove, Quantity is 300, in this case, the stock is updated to 800

Similarly, whenever a record is added in list B, check in list A, match the title and update its quantity, if Add then ammend the value, if Remove, then subtract the value of stock..

Any queries feel free to discuss,

Ideal skills for this project include:
- Extensive experience with Power Automate
- Proficiency in managing SharePoint lists
- Strong understanding of flow creation and automation techniques

Please note, this project does not involve automating emails or managing marketing content. It's solely focused on efficient and effective SharePoint list updates.

NOTE: please apply only if you have an expertise, done similar flow and can deliver in short time.