Does anyone have a general formula for working out BDA'S?

[DiMennzzaa]

im really struggling with them and i have no idea where to even start.

Does anyone have like a general guideline to follow

e.g.

1) Identify key dates
2) Workout how much has been consumed

etc

thanks

[link125]

Maybe try to visualise it like I do
Balance Day Adjustments Questions

That's how I understood the problem in the end, along with the help from tee