There is no linking of PNRs like that.
Either way, FTL benefits only apply to status holder, not to other travellers even on the same PNR.
So even if you were on the same booking, you would have 3 bags total (1 each from the Eco Classic award, and 1 extra for the FTL holder). And needless to say, you can't guest anyone to the lounge; however, if capacity allows you will be able to purchase a discounted guest pass for your partner (regardless of same reservation or not).