Quick Close-Out by CLIN?

Quote

242.708 Quick-closeout procedure.

(a) Defense Contract Management Agency administrative contracting officers are authorized to negotiate the settlement of direct and indirect costs for a specific contract, task order, or delivery order to be closed in advance of the determination of final direct costs and indirect rates set forth in FAR 42.705, regardless of the dollar value or percentage of unsettled direct or indirect costs allocable to the contract, task order, or delivery order.

(2) In lieu of the thresholds at FAR 42.708(a)(2)(i) and (ii), the amount of unsettled direct costs and indirect costs to be allocated to the contract, task order, or delivery order will be considered relatively insignificant when the total unsettled direct costs and indirect costs to be allocated to any one contract, task order, or delivery order do not exceed $2 million, regardless of the total contract, task order, or delivery order amount.

I'm wondering whether there is a prohibition on quick-close by CLIN. Suppose one or more CLINs have been successfully performed, delivered, and accepted. May the contracting parties agree to close out those CLINs while leaving others open until completion?