Basis Adjustment on form 8949

No, it's best to enter that transaction separately. If I understand you are asking about the entry in box 9, of your 1099-DIV. 

How to Report Cash in Lieu of Fractional Shares

1. The IRS considers cash for a fractional share to be money received as the result of a stock sale.
2. This transaction must be reported on IRS tax form Schedule D Capital Gains and Losses. 
3. The date of the sale (when cash was received) and the date of the original stock purchase is needed to complete the tax form.

Tax Basis Example:  Assume a shareholder has an aggregate $100 basis in 50 shares of ABC stock ($2 per share), and the fair market value of one share of ABC stock is $66.65. Following the ABC Merger, the shareholder should have an aggregate $100 basis in 64.1 shares of ABC stock (50 shares x 1.2820, or $1.56 per share), and should be treated as having sold 0.1 shares of ABC stock with a tax basis of $0.156 ($1.56 x 0.1 shares) for $6.67 ($66.65 per share fair market value x 0.1 fractional shares).

Once you have your information you will complete the entry in TurboTax using the following steps.

1. Open (continue) your return if it isn't already open.
2. In TurboTax, search (upper right) > Type 1099B  Press enter > Click the Jump to link 
3. Answer Yes to Did you sell stocks, mutual funds, bonds, or other investments in 2025?
   • If you see Here's the info we have for these investment sales, select Add More Sales.
4. Answer NO to Did you get a 1099-B or brokerage statement for these sales?  or Select Other sales 

If you have any additional questions about your wash sales, please update here and I will provides the overall details associated with wash sales.