This might be over kill, if you have given up on attempting aligning by clicking on the entire line and align the bottoms and or tops, try a shared variable.

Check documentation, but it works something like this.

Create a formula in your sub report (and use it)

In that formula create a shared variable and assign the value to be used by the main report to it ( Make sure the formula has that green check, that indicates that you used it)

Create a formula in the main report

Create a share variable with the same name. and simple state it in the formula

Example

Shared CurrencyVar RealizedPL;

RealizedPL

You may want to move the sub report out of the way and set the text to crwhite