2 sentences for 增减 (zēng​jiǎn)

1. 气温变化无常，出门时要注意随时增减衣服。

   qì​wēn biàn​huà​wú​cháng, chū​mén shí yào zhù​yì suí​shí zēng​jiǎn yī​fu.

   The temperature is unpredictable, so be mindful of adding or removing clothing as needed when going out.

   Source: Dong Chinese Dictionary

2. 随着市场需求的变化，每月的产量会有所增减。

   suí​zhe shì​chǎng xū​qiú de biàn​huà, měi yuè de chǎn​liàng huì yǒu​suǒ zēng​jiǎn.

   Monthly production will fluctuate with changes in market demand.

   Source: Dong Chinese Dictionary