Have swiss travel flex card, should i buy BO pass also?

What kind of flex card? 4 days in a month?
The BO pass would have given you a discount if you had purchased 8 day continuous passes or the Half Fare Card.
I would see if you can get these refunded and buy the Half Fare Card costing 120 CHF each, then the 4-day BO pass costing 196 CHF, or the 3-day Jungfrau Travel Pass for 165 CHF.

Hi Sam,
I bought 8-days flex card covering my entire report.
Since I am planning to stay/move around Wengen, I think I would need to buy BO pass also.
Is my understanding correct? Very confused with all these cards..
Or, pls let me know what I should be doing if I need to move around....
Thanks for your advise/recommendations.

You could have just bought an 8-day continuous pass and saved 20 CHF per person, but that is water over the dam at this point. I assume you are flying into Zurich and out of Geneva. In that case, use the pass continuously from June 8 to June 15.

A BO Pass would be overkill as it covers trips that are already covered by your 8-day Flex Pass. Further, the BO Pass no longer covers fully trips from Wengen to Kleine Scheidegg or the Jungfraujoch. You will get a 25% discount on these trips with your current pass. It will also give a 50% discount on the Schilthornbahn above Muerren.

The only thing I would consider is the 3-day Jungfrau Travel Pass. Cost is 165 CHF per adult with the 8-day Flex Pass in force. That fully covers Wengen to Kleine Scheidegg to Eigergletcher to Grindelwald to First. The Jungfraujoch gets a 50% discount from Eigergletcher to to the Jungfraujoch. Even so, you may not get the full savings over just the Flex Pass, but it will be more convenient not having to buy the individual tickets with the discount.
https://www.jungfrau.ch/en-gb/jungfrau-travel-pass/

Yes, my trip in Zurich and out Geneva. Appreciate your guidance. Thanks.